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question_answer1)
Which of the following pairs will not give Hydrogen?
A)
Al and conc. NaOH solution done
clear
B)
Zn and dil \[HN{{O}_{3}}\] done
clear
C)
Sodium and water done
clear
D)
Zn and dil \[HN{{O}_{3}}\] done
clear
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question_answer2)
When steam is passed over red hot iron
A)
no reaction takes place done
clear
B)
\[{{O}_{2}}\]and Fe \[{{\left( \text{OH} \right)}_{2}}\] are formed done
clear
C)
\[{{H}_{2}}\] and \[F{{e}_{3}}{{O}_{4}}\] are formed done
clear
D)
\[{{H}_{2}}\] and \[F{{e}_{2}}{{O}_{3}}\] are formed done
clear
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question_answer3)
Which of the following oxides can be reduced by hydrogen?
A)
CaO done
clear
B)
\[N{{a}_{2}}O\] done
clear
C)
\[A{{l}_{2}}{{O}_{3}}\] done
clear
D)
\[CuO\] done
clear
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question_answer4)
Hydrogen behaves as a metal
A)
At low temperature done
clear
B)
At low pressure done
clear
C)
At high temperature done
clear
D)
At high pressure done
clear
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question_answer5)
The most abundant non-metal in the earth's crust is
A)
Chlorine done
clear
B)
Hydrogen done
clear
C)
Silicon done
clear
D)
Oxygen done
clear
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question_answer6)
Which of the following alloys is ferrous alloys
A)
Bronze done
clear
B)
Brass done
clear
C)
Invar done
clear
D)
Duralumin done
clear
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question_answer7)
Metals
A)
have luster done
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B)
have 1,2 or 3 electrons in the outermost shell done
clear
C)
are malleable done
clear
D)
all of these done
clear
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question_answer8)
Gas which in cold (liquid form) expands on further cooling is
A)
Liquid Helium done
clear
B)
Liquid hydrogen done
clear
C)
Liquid ammonia done
clear
D)
Liquid oxygen done
clear
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question_answer9)
Which of the following can act as oxidizing agent?
A)
\[{{H}_{2}}\] done
clear
B)
CO done
clear
C)
Carbon done
clear
D)
\[{{H}_{2}}S\] done
clear
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question_answer10)
Aluminium reacts with caustic soda to form
A)
Sodium meta aluminate done
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B)
Alumining hydroxide done
clear
C)
Aluminium oxide done
clear
D)
Sodium tetra aluminate done
clear
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question_answer11)
Alloy formation gives rise to
A)
Decrease in corrosion- done
clear
B)
Increase in hardness done
clear
C)
Decrease in conductivity done
clear
D)
All are correct done
clear
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question_answer12)
Element which liberates oxygen and ozone from water is
A)
P done
clear
B)
Na done
clear
C)
F done
clear
D)
\[I\] done
clear
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question_answer13)
The second most abundant metal in the earth?s crust is
A)
Copper done
clear
B)
Aluminium done
clear
C)
Iron done
clear
D)
Zinc done
clear
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question_answer14)
Metallurgy is a process of extracting ^
A)
metal from its mineral done
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B)
metal from its ore done
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C)
pure metal from its ore done
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D)
metal from its pure ore done
clear
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question_answer15)
Matrix is defined as the
A)
unwanted foreign material present in the ore done
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B)
flux added to remove the unwanted impurities from ore done
clear
C)
slag formed as a result of the reaction of flux with gangue done
clear
D)
material used in the reduction of metal oxide to metal done
clear
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question_answer16)
Phosphorus normally exhibits a covalency of
A)
+3 and +5 done
clear
B)
+2 and +3 done
clear
C)
+1 and +2 done
clear
D)
+3 and +4 done
clear
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question_answer17)
Which of the following element is most metallic?
A)
P done
clear
B)
As done
clear
C)
Sb done
clear
D)
Bi done
clear
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question_answer18)
Nitrogen oxide which is paramagnetic, is
A)
\[N{{O}_{2}}\] done
clear
B)
\[{{N}_{2}}O\] done
clear
C)
NO done
clear
D)
\[{{N}_{2}}{{O}_{5}}\] done
clear
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question_answer19)
When concentrated nitric acid is heated with \[{{P}_{2}}{{O}_{5}}\], it forms
A)
\[{{H}_{3}}P{{O}_{4}}\] done
clear
B)
\[N{{O}_{2}}\] done
clear
C)
\[{{N}_{2}}{{O}_{5}}\] done
clear
D)
NO done
clear
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question_answer20)
Which of the following' is an ore of aluminium?
A)
Cryolite done
clear
B)
Feldspar done
clear
C)
Bauxite done
clear
D)
All of these done
clear
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question_answer21)
Function of adding cryolite in the extraction of aluminium from pure alumina is
A)
to increase the fusion temperature done
clear
B)
to decrease the conductivity of alumina done
clear
C)
to decrease the fusion temperature and increase the electrical conductivity done
clear
D)
none of these done
clear
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question_answer22)
Which of following oxides of nitric is anhydride of nitrous acid?
A)
NO done
clear
B)
\[{{N}_{2}}{{O}_{3}}\] done
clear
C)
\[{{N}_{2}}{{O}_{4}}\] done
clear
D)
\[{{N}_{2}}{{O}_{5}}\] done
clear
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question_answer23)
The chemical formula of bauxite is
A)
\[A{{l}_{2}}{{O}_{3}}\] done
clear
B)
\[A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}O\] done
clear
C)
\[N{{a}_{3}}Al{{F}_{6}}\] done
clear
D)
\[A{{l}_{2}}C{{l}_{6}}\] done
clear
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question_answer24)
The metals that cannot be obtained by electrolysis of the aqueous solution of their salts are
A)
Ag done
clear
B)
Mg done
clear
C)
Cu done
clear
D)
Al done
clear
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question_answer25)
Which of the following pair is correct?
A)
Melachite Copper done
clear
B)
Siderite Iron done
clear
C)
Galena Lead done
clear
D)
All of these done
clear
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question_answer26)
Aluminium is used in thermite welding because it
A)
is a light metal done
clear
B)
has more affinity for oxygen done
clear
C)
is a strong oxidising agent done
clear
D)
is a reactive metal done
clear
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question_answer27)
Ammonium dichromate on heating gives
A)
chromic oxide and nitrogen done
clear
B)
chromic acid and ammonia done
clear
C)
chromic acid and nitrogen done
clear
D)
chromic oxide and ammonia done
clear
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question_answer28)
When a mixture of cone. \[\text{HN}{{\text{O}}_{3}}\]and \[HCl\] warmed, we get
A)
\[C{{l}_{2}},N{{O}_{2}}\,and\,{{H}_{2}}O\] done
clear
B)
\[NO,C{{l}_{2}}\,and\,{{H}_{2}}O\] done
clear
C)
\[NOCl,C{{l}_{2}}\,and\,N{{O}_{2}}\] done
clear
D)
\[NOCl,C{{l}_{2}}\,and\,{{H}_{2}}O\] done
clear
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question_answer29)
The salt which is least likely to be found mineral is is
A)
chloride done
clear
B)
sulphate done
clear
C)
sulphide done
clear
D)
nitrate done
clear
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question_answer30)
Copper does not react with dilute \[HCl\] but reacts in the presence of air or oxygen because
A)
copper is ranked lower than hydrogen in the activity series done
clear
B)
\[HCl\] is not an oxidising agent done
clear
C)
air or oxygen oxidises the copper metal to copper (+ 2) ion done
clear
D)
all of these done
clear
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question_answer31)
Phosphorus is stored in
A)
water done
clear
B)
ammonia done
clear
C)
alcohol done
clear
D)
kerosene oil done
clear
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question_answer32)
In the long form of periodic table, all the non- metals are placed in
A)
s-block done
clear
B)
p-block done
clear
C)
d-block done
clear
D)
\[f\]-block done
clear
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question_answer33)
Which of the following is bad conductor of electricity?
A)
\[HF\] done
clear
B)
\[HCl\] done
clear
C)
\[HBr\] done
clear
D)
\[HI\] done
clear
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question_answer34)
Which of the following is a drying agent?
A)
Cone. \[{{H}_{2}}S{{O}_{4}}\] done
clear
B)
\[{{P}_{2}}{{O}_{5}}\] done
clear
C)
Silica gel done
clear
D)
All of these done
clear
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question_answer35)
Which of the following compounds is known as phosgene?
A)
\[P{{H}_{3}}\] done
clear
B)
\[POC{{l}_{3}}\] done
clear
C)
\[COC{{l}_{2}}\] done
clear
D)
\[C{{S}_{2}}\] done
clear
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question_answer36)
Aluminium does not oxidise readily in air because
A)
it is high in the electrochemical series done
clear
B)
it is low in the electrochemical series done
clear
C)
the metal does not combine with oxygen done
clear
D)
the metal is covered with a layer of oxide which does not rub off done
clear
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question_answer37)
Aluminium is extracted by
A)
heating sodium aluminium silicate to a high temperature done
clear
B)
treating cryolite with sodium hydroxide solution under pressure done
clear
C)
heating aluminium oxide with coke in a furnace done
clear
D)
the electrolysis of molten aluminium oxide in fused cryolite done
clear
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question_answer38)
Which of the following compounds can make clothes fire proof?
A)
\[FeS{{O}_{4}}\] done
clear
B)
\[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] done
clear
C)
\[C{{u}_{2}}S{{O}_{4}}\] done
clear
D)
\[MgS{{O}_{4}}.7{{H}_{2}}O\] done
clear
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question_answer39)
Glass is a :
A)
crystalline solid done
clear
B)
solid having a definite melting point done
clear
C)
supper cooled liquid done
clear
D)
chemical compound done
clear
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question_answer40)
The gradual cooling of glass or glass articles is called
A)
tempering done
clear
B)
annealing done
clear
C)
quenching done
clear
D)
galvanizing done
clear
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question_answer41)
Carborundum is commercial name of
A)
\[Ca{{C}_{2}}\] done
clear
B)
\[C{{O}_{2}}\] done
clear
C)
\[A{{l}_{2}}{{O}_{3}}\] done
clear
D)
Sic done
clear
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question_answer42)
In which of the following minerals, aluminium is not present?
A)
Cryolite done
clear
B)
Mica done
clear
C)
Feldspar done
clear
D)
Fluor spar done
clear
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question_answer43)
Which of the following gives black precipitate with \[{{H}_{2}}S\] ?
A)
Cupric chloride done
clear
B)
Cadmium chloride done
clear
C)
Zinc chloride done
clear
D)
Ferric chloride done
clear
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question_answer44)
Which of the following compounds has phosphorus atom in + 1 oxidation state?
A)
\[{{H}_{3}}P{{O}_{3}}\] done
clear
B)
\[{{H}_{3}}P{{O}_{4}}\] done
clear
C)
\[{{H}_{3}}P{{O}_{2}}\] done
clear
D)
\[{{H}_{4}}{{P}_{2}}{{O}_{7}}\] done
clear
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question_answer45)
Which of the following mixtures is used in the preparation of tips of match sticks?
A)
\[\text{S }+\text{ K}\] done
clear
B)
\[S{{b}_{2}}{{S}_{3}}+S\] done
clear
C)
\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+S+P\] done
clear
D)
\[P+K\] done
clear
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question_answer46)
Which one of the following has the lowest m.p. ?
A)
\[\text{B}\] done
clear
B)
\[Al\] done
clear
C)
\[\text{Ga}\] done
clear
D)
\[Tl\] done
clear
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question_answer47)
Aqueous solution of hydrogen sulphide and sulphur dioxide when mixed together yield
A)
Sulphur and water done
clear
B)
Hydrogen peroxide and sulphur done
clear
C)
Sulphur trioxide and water done
clear
D)
Hydrogen and sulphurous acid done
clear
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question_answer48)
\[\text{S}{{\text{O}}_{\text{2}}}\]oxidises
A)
\[\text{Mg}\] done
clear
B)
\[{{\text{H}}_{2}}S{{O}_{4}}\] done
clear
C)
\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] done
clear
D)
All of these done
clear
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question_answer49)
An acid having a peroxy linkage is
A)
puro sulphuric acid done
clear
B)
care's acid done
clear
C)
dithionic acid done
clear
D)
all of these done
clear
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question_answer50)
Iron
A)
is the metal is magnetic done
clear
B)
forms an alloy called steel done
clear
C)
cast iron is brittle done
clear
D)
all of these done
clear
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question_answer51)
When sodium hydroxide solution is added to a freshly prepared solution of ferrous sulphate, a green precipitate of ferrous hydroxide is formed which on standing becomes brown because
A)
ferric salts are unstable done
clear
B)
the mixture becomes dirty done
clear
C)
ferrous hydroxide becomes ferric oxide done
clear
D)
green ferrous hydroxide oxidises to brown ferric hydroxide done
clear
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question_answer52)
\[{{\text{H}}_{2}}S{{O}_{4}}\] acts as dehydrating agent in its reaction with
A)
\[Ba{{(OH)}_{2}}\] done
clear
B)
\[NaOH\] done
clear
C)
\[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] done
clear
D)
All of these done
clear
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question_answer53)
Electrolysis of \[{{\text{H}}_{2}}S{{O}_{4}}\] produces at anode
A)
\[{{\text{H}}_{2}}\] done
clear
B)
\[{{O}_{2}}\] done
clear
C)
\[{{\text{H}}_{2}}{{S}_{2}}{{O}_{8}}\] done
clear
D)
\[{{\text{H}}_{2}}{{S}_{2}}{{O}_{3}}\] done
clear
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question_answer54)
Which of the following gives \[S{{O}_{3}}\] on heating
A)
\[{{\text{H}}_{2}}S{{O}_{4}}\] done
clear
B)
\[CuS{{O}_{4}}+C\] done
clear
C)
\[FeS{{O}_{4}}\] done
clear
D)
\[{{\text{H}}_{2}}S{{O}_{4}}+PC{{l}_{3}}\] done
clear
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question_answer55)
Strongest acid among the following is
A)
\[{{\text{H}}_{2}}O\] done
clear
B)
\[{{\text{H}}_{2}}S\] done
clear
C)
\[{{\text{H}}_{2}}Se\] done
clear
D)
\[{{\text{H}}_{2}}Te\] done
clear
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question_answer56)
Which of the following salts would give \[\text{S}{{\text{O}}_{\text{2}}}\]with dil. \[{{\text{H}}_{2}}S{{O}_{4}}\]and also decolourises bromine water?
A)
\[N{{a}_{2}}S{{O}_{4}}\] done
clear
B)
\[NaHS{{O}_{4}}\] done
clear
C)
\[N{{a}_{2}}S{{O}_{3}}\] done
clear
D)
\[N{{a}_{2}}S\] done
clear
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question_answer57)
Which of the following compounds is known Chile salt petre ?
A)
\[KN{{O}_{3}}\] done
clear
B)
\[N{{H}_{4}}N{{O}_{3}}\] done
clear
C)
\[Ca{{(N{{O}_{3}})}_{2}}\] done
clear
D)
\[NaN{{O}_{3}}\] done
clear
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question_answer58)
On prolonged exposure to air, sodium finally changes to
A)
\[N{{a}_{2}}O\] done
clear
B)
\[N{{a}_{2}}{{O}_{2}}\] done
clear
C)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\] done
clear
D)
\[NaOH\] done
clear
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question_answer59)
Which of the following chlorides can be extracted with ether?
A)
\[NaCl\] done
clear
B)
\[KCl\] done
clear
C)
\[BaC{{l}_{2}}\] done
clear
D)
\[LiCl\] done
clear
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question_answer60)
Molecular formula of glauber's salt is
A)
\[MgS{{O}_{4}}.7{{H}_{2}}O\] done
clear
B)
\[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\] done
clear
C)
\[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\] done
clear
D)
\[FeS{{O}_{4}}.7{{H}_{2}}O\] done
clear
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question_answer61)
Which of the following absorbs largest volume of hydrogen?
A)
colloidal palladium done
clear
B)
finely divided nickel done
clear
C)
colloidal ferric hydroxide done
clear
D)
finely divided platinum done
clear
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question_answer62)
The reducing agent used in the blast furnace to reduce \[F{{e}_{2}}{{O}_{3}}\] to Fe is
A)
coke done
clear
B)
carbon done
clear
C)
lime stone done
clear
D)
carbon monoxide done
clear
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question_answer63)
Which of the following is known as soda ash?
A)
\[NaOH\] done
clear
B)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}.{{H}_{2}}O\] done
clear
C)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\] done
clear
D)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{4}}\] done
clear
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question_answer64)
Chemical formula of washing soda is
A)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\] done
clear
B)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}.10{{H}_{2}}O\] done
clear
C)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}.5{{H}_{2}}O\] done
clear
D)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{4}}.10{{H}_{2}}O\] done
clear
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question_answer65)
Which of the following compounds is known as baking soda?
A)
Sodium carbonate done
clear
B)
Calcium carbonate done
clear
C)
Sodium bicarbona done
clear
D)
Calcium bicarbor done
clear
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question_answer66)
Sodium burns in dry air finally giving
A)
\[\text{N}{{\text{a}}_{\text{2}}}\text{O}\] done
clear
B)
\[\text{N}{{\text{a}}_{2}}{{\text{O}}_{2}}\] done
clear
C)
\[\text{Na}{{\text{O}}_{2}}\] done
clear
D)
\[\text{N}{{\text{a}}_{3}}N\] done
clear
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question_answer67)
Which of the following compounds is known epsom salt?
A)
\[CaS{{O}_{4}}.2{{H}_{2}}O\] done
clear
B)
\[MgS{{O}_{4}}.7{{H}_{2}}O\] done
clear
C)
\[FeS{{O}_{4}}.7{{H}_{2}}O\] done
clear
D)
\[M{{g}_{3}}{{(P{{O}_{4}})}_{2}}\] done
clear
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question_answer68)
The low boiling metals are purified by
A)
Distillation done
clear
B)
Poling done
clear
C)
Liquation done
clear
D)
Slag done
clear
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question_answer69)
Element present in the stainless steel is
A)
Iron done
clear
B)
Chromium done
clear
C)
Nickel done
clear
D)
All of these done
clear
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question_answer70)
A compound which is called microcosmic salt
A)
\[N{{a}_{2}}HP{{O}_{4}}.2{{H}_{2}}O\] done
clear
B)
\[Na{{H}_{2}}P{{O}_{4}}.{{H}_{2}}O\] done
clear
C)
\[Na(N{{H}_{4}})HP{{O}_{4}}.4{{H}_{2}}O\] done
clear
D)
\[Na(N{{H}_{4}})P{{O}_{4}}.2{{H}_{2}}O\] done
clear
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question_answer71)
Magnesium metal is heated to redness in the presence of nitrogen and on cooling water added. The gas evolved is
A)
\[{{N}_{2}}\] done
clear
B)
\[{{H}_{2}}\] done
clear
C)
\[N{{H}_{3}}\] done
clear
D)
\[{{O}_{2}}\] done
clear
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question_answer72)
Which of the following compounds imparts red colour to the flame and decomposes on heating to give oxygen and a brown gas?
A)
\[\text{CaC}{{\text{O}}_{\text{3}}}\] done
clear
B)
\[\text{MgN}{{\text{O}}_{\text{3}}}\] done
clear
C)
\[\text{MgC}{{\text{O}}_{\text{3}}}\] done
clear
D)
\[\text{Ca }{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{2}}\] done
clear
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question_answer73)
Lithophone, a white pigment, is the mixture of
A)
\[BaS{{O}_{4}}\]and \[ZnS\] done
clear
B)
\[BaS\,and\,ZnS{{O}_{4}}\] done
clear
C)
\[CaS{{O}_{4}}\,and\,ZnS{{O}_{4}}\] done
clear
D)
\[CaS\,and\,ZnS{{O}_{4}}\] done
clear
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question_answer74)
When non-metal reacts with oxygen, they form,
A)
amphoteric oxide done
clear
B)
covalent bond done
clear
C)
basic oxide done
clear
D)
none of these done
clear
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question_answer75)
Which of the following is liquid at ordinary temperature?
A)
Germanium done
clear
B)
Gallium done
clear
C)
Gold done
clear
D)
Galena done
clear
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question_answer76)
In the Frasch process for the extraction of sulphur, superheated steam is forced down the outermost of the three concentric pipes.
A)
wash the sulphur clean done
clear
B)
remove thenlmpuririties done
clear
C)
melt the sulphur done
clear
D)
dissolve sulphur dioxide done
clear
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question_answer77)
Alkali metal ions in aqueous solution, which is The best conductor of electricity is
A)
\[L{{i}^{+}}\] done
clear
B)
\[N{{a}^{+}}\] done
clear
C)
\[{{K}^{+}}\] done
clear
D)
\[C{{s}^{+}}\] done
clear
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question_answer78)
\[K{{O}_{2}}\] is an example of
A)
normal oxide done
clear
B)
super oxide done
clear
C)
sub oxide done
clear
D)
peroxide done
clear
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question_answer79)
The hydroxide, which is soluble in excess of sodium hydroxide is
A)
\[\text{Fe }{{\left( \text{OH} \right)}_{\text{3}}}\] done
clear
B)
\[\text{Cu }{{\left( \text{OH} \right)}_{2}}\] done
clear
C)
\[\text{Cr}{{\left( \text{OH} \right)}_{\text{3}}}\] done
clear
D)
\[Al{{\left( \text{OH} \right)}_{\text{3}}}\] done
clear
View Solution play_arrow
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question_answer80)
The product of electrolysis of cone. solution of common salt is
A)
\[Na+C{{l}_{2}}\] done
clear
B)
\[{{H}_{2}}+{{O}_{2}}\] done
clear
C)
\[NaOH+{{H}_{2}}+C{{l}_{2}}\] done
clear
D)
\[Na+C{{l}_{2}}+{{O}_{2}}\] done
clear
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question_answer81)
Iron obtained from blast furnace is known as
A)
pig iron done
clear
B)
cast iron done
clear
C)
wrought iron done
clear
D)
steel done
clear
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question_answer82)
Metal present in gun metal are
A)
\[\text{Cu},\text{ Zn},\text{ Ni}\] done
clear
B)
\[\text{Cu},\text{ Sn},\text{ and Zn}\] done
clear
C)
\[\text{Cu},\text{ Sn}\] done
clear
D)
\[Cu,Al\] done
clear
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question_answer83)
Metal which does not form amalgam is
A)
Zn done
clear
B)
Ag done
clear
C)
Cu done
clear
D)
Fe done
clear
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question_answer84)
Axels are made by heating rods of iron embedded in charcoal powder. This process is known as
A)
tempering done
clear
B)
annealing done
clear
C)
case hardening done
clear
D)
hardening done
clear
View Solution play_arrow
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question_answer85)
Nitriding is a process of heating steel in atmosphere of
A)
\[\text{N}{{\text{H}}_{\text{3}}}\] done
clear
B)
\[{{\text{N}}_{2}}\] done
clear
C)
Oxygen done
clear
D)
Carbon dioxide done
clear
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question_answer86)
\[FeS{{O}_{4}}\].\[7{{H}_{2}}O\] is known as
A)
green vitriol done
clear
B)
white vitriol done
clear
C)
blue vitriol done
clear
D)
vitriol done
clear
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question_answer87)
Rhombic, monoclmic and plastic sulphur are
A)
isomers done
clear
B)
isotopes done
clear
C)
allotropes done
clear
D)
hydrides of sulphur done
clear
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question_answer88)
Which one of the following metals is present in german silver?
A)
Ni done
clear
B)
Zn done
clear
C)
Cu done
clear
D)
All of these done
clear
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question_answer89)
Bronze statues mainly contain
A)
iron done
clear
B)
copper and zinc done
clear
C)
copper and nickel done
clear
D)
copper and Zn done
clear
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question_answer90)
The percentage of silver in german silver is
A)
2.0 % done
clear
B)
10% done
clear
C)
20 % done
clear
D)
zero done
clear
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question_answer91)
The element which is alloyed with copper to form brass?
A)
Pb done
clear
B)
Bi done
clear
C)
Zn done
clear
D)
Sb done
clear
View Solution play_arrow
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question_answer92)
When sulphur is heated slowly in a narrow test tube, it melts
A)
and then burns done
clear
B)
to an amber mobile liquid which on further heating, darkens and becomes viscous before becoming mobile again done
clear
C)
and then bursts into flame done
clear
D)
to a pale yellow liquid which solidifies at the end of the test tube done
clear
View Solution play_arrow
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question_answer93)
Mercury is transported in containers made of
A)
\[Ag\] done
clear
B)
\[Pb\] done
clear
C)
\[Al\] done
clear
D)
\[Fe\] done
clear
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question_answer94)
Which of the following compounds sublimes on heating?
A)
\[HgC{{l}_{2}}\] done
clear
B)
\[\text{AgN}{{\text{O}}_{\text{3}}}\] done
clear
C)
\[ZnC{{l}_{2}}\] done
clear
D)
\[H{{g}_{2}}C{{l}_{2}}\] done
clear
View Solution play_arrow
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question_answer95)
The metal used for making radiation sheild is
A)
\[Al\] done
clear
B)
Fe done
clear
C)
Zn done
clear
D)
Pb done
clear
View Solution play_arrow
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question_answer96)
Lead pipes are readily corroded by
A)
water done
clear
B)
acetic acid done
clear
C)
cone. \[{{H}_{2}}S{{O}_{4}}\] done
clear
D)
dil \[{{H}_{2}}S{{O}_{4}}\] done
clear
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question_answer97)
Which of the following is the lightest metallic element?
A)
Mg done
clear
B)
\[Al\] done
clear
C)
Li done
clear
D)
Mn done
clear
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question_answer98)
Which of the following pair of elements form alloy?
A)
Zn and Pb done
clear
B)
Fe and C done
clear
C)
Hg and Ag done
clear
D)
All of these done
clear
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question_answer99)
Sulphur on reaction with concentrated sulphuric acid forms sulphur dioxide. According to this reaction, sulphuric acid is behaving as
A)
drying agent done
clear
B)
oxidising agent done
clear
C)
dehydrating agent done
clear
D)
none of these done
clear
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question_answer100)
Which of the following elements shows allotropy?
A)
Mg done
clear
B)
Cs done
clear
C)
Sn done
clear
D)
Zn done
clear
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question_answer101)
Solder is an alloy of
A)
Cu and Zn done
clear
B)
Pb and Sb done
clear
C)
Cu and Ni done
clear
D)
Pb and Sn done
clear
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question_answer102)
German silver is an alloy of
A)
Cu, Ni and Zn done
clear
B)
Cu and Ag done
clear
C)
Cu and Sn done
clear
D)
Cu, Zn, Ag done
clear
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question_answer103)
Cinnabar is an ore of
A)
Zn done
clear
B)
Sn done
clear
C)
Pb done
clear
D)
Hg done
clear
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question_answer104)
A compound which gives oxygen on moderate heating is
A)
ZnO done
clear
B)
\[A{{l}_{2}}{{O}_{3}}\] done
clear
C)
\[F{{e}_{2}}{{O}_{3}}\] done
clear
D)
\[HgO\] done
clear
View Solution play_arrow
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question_answer105)
Ion present in the Nessler's reagent is
A)
\[H{{g}^{+}}\] done
clear
B)
\[H{{g}^{+2}}\] done
clear
C)
\[{{[Hg{{I}_{4}}]}^{-2}}\] done
clear
D)
\[{{[Hg{{(N{{H}_{3}})}_{4}}]}^{+2}}\] done
clear
View Solution play_arrow
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question_answer106)
The correct formula of washing soda is
A)
\[N{{a}_{2}}C{{O}_{3}}\] done
clear
B)
\[N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O\] done
clear
C)
\[N{{a}_{2}}C{{O}_{3}}.9{{H}_{2}}O\] done
clear
D)
\[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\] done
clear
View Solution play_arrow
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question_answer107)
Aqueous solution of which of the following salts turns the red litmus blue?
A)
\[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\] done
clear
B)
\[\text{NaHC}{{\text{O}}_{\text{3}}}\] done
clear
C)
\[\text{N}{{\text{a}}_{2}}\text{C}{{\text{O}}_{\text{3}}}.10{{H}_{2}}O\] done
clear
D)
All of these done
clear
View Solution play_arrow
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question_answer108)
If tartaric acid is not added in baking powder cake will taste bitter due to the presence of
A)
sodium hydrogen carbonate done
clear
B)
carbon dioxide done
clear
C)
sodium carbonate done
clear
D)
all of these done
clear
View Solution play_arrow
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question_answer109)
Soda-acid fire extinguisher extinguishes the fir
A)
cutting the supply of air done
clear
B)
removing the combustible substance done
clear
C)
raising the ignition temperature done
clear
D)
none of these done
clear
View Solution play_arrow
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question_answer110)
Which of the following compounds is known as sugar of lead?
A)
\[PbS{{O}_{4}}\] done
clear
B)
\[\text{PbC}{{\text{O}}_{3}}\] done
clear
C)
\[{{(C{{H}_{3}}COO)}_{2}}Pb\] done
clear
D)
\[Pb{{I}_{2}}\] done
clear
View Solution play_arrow
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question_answer111)
Which of the following is the composition of red lead?
A)
PbO done
clear
B)
\[Pb{{O}_{2}}\] done
clear
C)
\[P{{b}_{3}}{{O}_{4}}\] done
clear
D)
\[Pb{{I}_{2}}\] done
clear
View Solution play_arrow
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question_answer112)
Which of the following is known as white lead (Safeda)?
A)
\[\text{PbC}{{\text{O}}_{\text{3}}}\] done
clear
B)
\[\text{2PbC}{{\text{O}}_{\text{3}}}.Pb{{(OH)}_{2}}\] done
clear
C)
\[\text{PbS}{{\text{O}}_{4}}.PbO\] done
clear
D)
\[\text{PbC}{{\text{O}}_{3}}.Pb{{O}_{2}}\] done
clear
View Solution play_arrow
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question_answer113)
Nitrates of all metals are
A)
unstable done
clear
B)
coloured done
clear
C)
insoluble in water done
clear
D)
soluble in water done
clear
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question_answer114)
The simplest formula of bleaching powder is
A)
\[Ca(OC{{l}_{2}})\] done
clear
B)
\[CaOC{{l}_{2}}\] done
clear
C)
\[CaOC{{l}_{2}}.{{H}_{2}}O\] done
clear
D)
\[Ca(OC{{l}_{2}}).2{{H}_{2}}O\] done
clear
View Solution play_arrow
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question_answer115)
The substance which, on treating with chlorine, yields bleaching powder is
A)
quick lime done
clear
B)
slaked lime done
clear
C)
limestone done
clear
D)
gypsum done
clear
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question_answer116)
Of the following metals, the most reactive Metal is
A)
Fe done
clear
B)
Ni done
clear
C)
Pt done
clear
D)
Au done
clear
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question_answer117)
Iron is rendered passive by the treatment with
A)
cone. \[HCl\] done
clear
B)
cone. \[HN{{O}_{3}}\] done
clear
C)
cone. \[{{H}_{2}}N{{O}_{4}}\] done
clear
D)
cone. \[{{H}_{3}}P{{O}_{4}}\] done
clear
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question_answer118)
Which of the following is a ferrous alloy?
A)
Solder done
clear
B)
Invar done
clear
C)
Type metal done
clear
D)
Magnalium done
clear
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question_answer119)
The dead burnt plaster is
A)
\[CaS{{O}_{4}}.2{{H}_{2}}O\] done
clear
B)
\[CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O\] done
clear
C)
\[CaS{{O}_{4}}\] done
clear
D)
\[2CaS{{O}_{4}}.{{H}_{2}}O\] done
clear
View Solution play_arrow
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question_answer120)
Which of the following reactions is known as slaking of lime?
A)
\[CaS{{O}_{3}}\to CaO+C{{O}_{2}}\] done
clear
B)
\[CaO+2HCl\to CaC{{l}_{2}}+{{H}_{2}}O\] done
clear
C)
\[CaC{{O}_{3}}+{{H}_{2}}O\to Ca{{(OH)}_{2}}+C{{O}_{2}}\] done
clear
D)
\[CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}\] done
clear
View Solution play_arrow
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question_answer121)
High purity copper is obtained by
A)
carbon reduction process done
clear
B)
hydrogen reduction process done
clear
C)
electrolytic reduction process done
clear
D)
thermite process done
clear
View Solution play_arrow
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question_answer122)
Bleaching powder is soluble in cold water giving a milky solution due to
A)
available chlorine done
clear
B)
lime present in it done
clear
C)
calcium carbonate formation done
clear
D)
the absorption of carbon dioxide from atmosphere done
clear
View Solution play_arrow
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question_answer123)
In which of the following pair, both the substances are chemically same?
A)
milk of lime and lime water done
clear
B)
dead burnt plaster and gypsum done
clear
C)
alumina and gypsum done
clear
D)
gypsum and Plaster of Paris done
clear
View Solution play_arrow
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question_answer124)
Raw materials used for the manufacture of Portland cement are
A)
gypsum and limestone done
clear
B)
limestone and clay done
clear
C)
alumina, clay and gypsum done
clear
D)
gypsum and clay done
clear
View Solution play_arrow
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question_answer125)
\[{{\text{K}}_{\text{4}}}\text{ }[\text{Fe }{{\left( \text{CN} \right)}_{6}}]\]is called
A)
potassium hexacyano ferrate (\[\text{(II)}\] done
clear
B)
potassium hexacyano ferrate \[\text{(III)}\] done
clear
C)
potassium fcrricyanide done
clear
D)
prussian blue done
clear
View Solution play_arrow
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question_answer126)
Gypsum is added to cement to
A)
make the mixture more homogeneous done
clear
B)
improve the texture of cement done
clear
C)
make the cement light weight done
clear
D)
(d ) delay the setting time of cement done
clear
View Solution play_arrow
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question_answer127)
Average composition of ordinary glass is
A)
\[N{{a}_{2}}O.\,CaO.\,6Si{{O}_{2}}\] done
clear
B)
\[N{{a}_{2}}O.\,2CaO.\,3Si{{O}_{2}}\] done
clear
C)
\[N{{a}_{2}}O.\,CaO.\,6Si{{O}_{2}}.C{{r}_{2}}{{O}_{3}}\] done
clear
D)
\[N{{a}_{2}}O.\,CaO.PbO.\,6Si{{O}_{2}}\] done
clear
View Solution play_arrow
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question_answer128)
Colour of \[F{{e}^{+2}}\] ion is
A)
blue done
clear
B)
light green done
clear
C)
very dark green done
clear
D)
yellow done
clear
View Solution play_arrow
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question_answer129)
Number of unpaired electrons in \[F{{e}^{+3}}\] ion is
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
0 done
clear
View Solution play_arrow
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question_answer130)
Glass used for making laboratory apparatus is
A)
pyrex glass done
clear
B)
hard glass done
clear
C)
soft glass done
clear
D)
safety glass done
clear
View Solution play_arrow
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question_answer131)
The windscreen of cars, aeroplanes etc. is made up of
A)
hard glass done
clear
B)
safety glass done
clear
C)
lead glass done
clear
D)
soda glass done
clear
View Solution play_arrow
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question_answer132)
Which of the substance is present in the photochromatic glass?
A)
PbO done
clear
B)
\[C{{r}_{2}}{{O}_{3}}\] done
clear
C)
Borax done
clear
D)
Silver bromide done
clear
View Solution play_arrow
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question_answer133)
Steel is mainly an alloy of iron and
A)
chromium done
clear
B)
nickel done
clear
C)
manganese done
clear
D)
carbon done
clear
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question_answer134)
If steel is heated bright red hot, and is then cooled slowly, the process is called
A)
quenching done
clear
B)
annealing done
clear
C)
tempering done
clear
D)
smelting done
clear
View Solution play_arrow
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question_answer135)
Which of the following is soluble in ammonia?
A)
\[\text{Cr }{{\left( \text{OH} \right)}_{\text{3}}}\] done
clear
B)
\[Cu{{(OH)}_{2}}\] done
clear
C)
\[Fe{{(OH)}_{3}}\] done
clear
D)
\[Al{{(OH)}_{3}}\] done
clear
View Solution play_arrow