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question_answer1)
Aluminum vessels should not be washed with materials containing washing soda since
A)
Washing soda is expensive done
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B)
Washing soda is easily decomposed done
clear
C)
Washing soda reacts with Al to form insoluble aluminum oxide. done
clear
D)
Washing soda reacts with Al to form soluble aluminate done
clear
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question_answer2)
Among the halides
(I) \[BC{{l}_{3}}\] |
(II) \[AlC{{l}_{3}}\] |
(III) \[GaC{{l}_{3}}\] |
(IV) \[InC{{l}_{3}}\] |
The order of decreasing Lewis acid character is:
A)
I, II, III, IV done
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B)
II, III, IV, I done
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C)
III, IV, II, I done
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D)
IV, III, II, I done
clear
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question_answer3)
\[BC{{l}_{3}}\]does not exist as dimer but \[B{{H}_{3}}\]exist as dimer (\[{{B}_{2}}{{H}_{6}}\]) because
A)
Chlorine is more electronegative than hydrogen done
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B)
There is \[p\pi \]-\[p\pi \]back bonding in \[BC{{l}_{3}}\] but \[B{{H}_{3}}\]does not contain such multiple bonding done
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C)
Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms done
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D)
None of the above done
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question_answer4)
A mixture of boric acid with ethy1 alcohol burns with green edged flame due to the formation of
A)
Ethy 1 borax done
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B)
Ethy1 borate done
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C)
Methy1 Borax done
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D)
Methy1 borate done
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question_answer5)
How the reaction below can be made to proceed in forward direction? \[B{{(OH)}_{3}}+NaOH\to [NaB{{(OH)}_{4}}]\,or\,[NaB{{O}_{2}}+{{H}_{2}}O]\]
A)
Addition of borax done
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B)
Addition of cis-1, 2-diol done
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C)
Addition of trans-1, 2-diol done
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D)
Addition of \[N{{a}_{2}}HP{{O}_{4}}\] done
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question_answer6)
Correct order of stability of hydrides of carbon family is
A)
\[C{{H}_{4}}>Si{{H}_{4}}>Ge{{H}_{4}}>Sn{{H}_{4}}>Pb{{H}_{4}}\] done
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B)
\[C{{H}_{4}}<Si{{H}_{4}},<Ge{{H}_{4}}<Sn{{H}_{4}}<Pb{{H}_{4}}\] done
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C)
\[C{{H}_{4}}.>Sn{{H}_{4}},>Ge{{H}_{4}}>Sn{{H}_{4}}>Pb{{H}_{4}}\] done
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D)
None of the above done
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question_answer7)
An oxide of carbon (X) reacts with ammonia to produce urea an important fertilizer. Which of the following combinations will not Yield (X).
A)
\[C{{O}^{2-}}_{3}+HCl\xrightarrow{\Delta }\] done
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B)
\[CaO+C\xrightarrow{\Delta }\] done
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C)
\[C+Excess{{O}_{2}}\xrightarrow{\Delta }\] done
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D)
\[HC{{O}^{-}}_{3}+HCl\xrightarrow{\Delta }\] done
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question_answer8)
Select the incorrect statement.
A)
Silicones are hydrophobic in nature. done
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B)
Si-O-Si linkages are moisture sensitive. done
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C)
\[Sn{{I}_{4}}\]is an orange solid on account of charge transfer. done
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D)
Silicones are resistant to most chemicals due to high strength of the Si-C bond and stable silica like structure of Si-O-Si-O-Si. done
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question_answer9)
A gas does not turn lime water milky, supports the combustion of burning magnesium. It has no smell and is colourless. It extinguishes a glowing splint but under some circumstances reacts with oxygen and hydrogen. It is not poisonous. The gas is likely to be:
A)
Nitrogen done
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B)
Water vapour done
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C)
Carbon disoxide done
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D)
Helium done
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question_answer10)
Aluminum is more reactive than iron because its standard reduction potential is higher, still aluminum is less easily corroded than iron because:
A)
It has higher reducing power and forms self-protective layer of \[A{{l}_{2}}{{O}_{3}}\] done
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B)
It has higher reducing power and does not react with oxygen so easily done
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C)
Al reacts with atmospheric carbon dioxide to form a self-protective layer of \[A{{l}_{2}}{{O}_{3}}+A{{l}_{4}}{{C}_{3}}\] done
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D)
all of the above done
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question_answer11)
A certain salt (X) gives the following tests:
(i) Its aqueous solution is alkaline to litmus. |
(ii) On strongly heating it swells to give a glassy bead |
(iii) When concentrated sulphuric acid is added to hot concentrated solution of (x), crystals of \[{{H}_{3}}B{{O}_{3}}\]separate out. Identify the colour of these crystals. |
A)
Violet done
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B)
Blue done
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C)
Brown done
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D)
White done
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question_answer12)
Which of the following statements is correct?
A)
\[BC{{l}_{3}}\] and \[AlC{{I}_{3}}\]are both Lewis acids and \[BC{{l}_{3}}\]is stronger than \[AlC{{l}_{3}}\] done
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B)
\[BC{{l}_{3}}\]and \[AlC{{l}_{3}}\]both Lew is acids and \[AlC{{l}_{3}}\]is stronger that \[BC{{l}_{3}}\] done
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C)
\[BC{{l}_{3}}\] and \[AlC{{I}_{3}}\]are both equally strong Lewis acids done
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D)
Both \[BC{{l}_{3}}\]and \[AlC{{l}_{3}}\] are not Lewis acids. done
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question_answer13)
Precipitation of \[A{{l}^{3+}}\](aq) \[Al{{(OH)}_{3}}\]by \[C{{O}_{2}}\] shows that
A)
The acidic property is very weak done
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B)
The acidic property is very strong done
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C)
The basic property is very strong done
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D)
The basic property is very weak done
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question_answer14)
Boron of highest purity (~99.9%)is obtained by
A)
Reduction of \[{{B}_{2}}{{O}_{3}}\]by mg. done
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B)
Electrolysis of fused tetrafluoroborates (\[KB{{F}_{4}}\]) in molten KF. done
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C)
Reduction of \[BC{{l}_{3}}\]with \[{{H}_{2}}\]at 1270 K. done
clear
D)
thermal decomposition of boranes at 1173 K. done
clear
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question_answer15)
\[C{{a}_{2}}{{B}_{6}}{{O}_{11}}+2N{{a}_{2}}C{{O}_{3}}\to X-2CaC{{O}_{3}}+2NaB{{O}_{2}}.\] The compound X in the above reaction is
A)
\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\] done
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B)
\[HB{{O}_{2}}\] done
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C)
\[{{H}_{3}}B{{O}_{3}}\] done
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D)
\[{{H}_{2}}{{B}_{4}}{{O}_{7}}\] done
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question_answer16)
Which of the statement is true for the above sequence of reactions?
A)
Z is hydrogen done
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B)
Y is \[LiB{{F}_{4}}\] done
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C)
Z and Y are \[{{F}_{2}}\]and \[{{B}_{2}}{{H}_{6}}\] respectively done
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D)
Z is potassium hydroxide done
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question_answer17)
A compound of boron X reacts at \[200{}^\circ C\]temperature with \[N{{H}_{3}}\]to give another compound Y which is called as inorganic benzene. The compound Y is a colourless liquid and is highly light sensitive. Its melting point is \[-57{}^\circ C\]. The compound X with excess of \[N{{H}_{3}}\] and at a still higher temperature gives boron nitride (\[{{(BN)}_{n}}\]). The compounds X and Y are respectively:
A)
\[B{{H}_{3}}\] and \[{{B}_{2}}{{H}_{6}}\] done
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B)
\[NaB{{H}_{4}}\]and\[{{C}_{6}}{{H}_{6}}\] done
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C)
\[{{B}_{2}}{{H}_{6}}\]and \[{{B}_{3}}{{N}_{3}}{{H}_{6}}\] done
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D)
\[{{B}_{4}}{{C}_{3}}\]and \[{{C}_{6}}{{H}_{6}}\] done
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question_answer18)
Consider following statements:
I: In diamond, each carbon atom is linked tetratedrally to four other carbon atoms by \[s{{p}^{3}}\]bonds. |
II: Graphite has planar hexagonal layers of carbn atoms held together by planar hexagonal layers of carbon atoms held together by weak van der Waals forces. |
III: Silicon exists only in diamond structure due to its tendency to form \[p\pi \]-\[p\pi \]bonds to itself. |
A)
Only I and II are correct done
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B)
Only I is Correct done
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C)
Only II and III are correct done
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D)
All are correct statement done
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question_answer19)
Prussic acid \[+{{O}_{2}}\xrightarrow{Ag}\] The products of the above reaction are:
A)
\[{{C}_{2}}{{N}_{2}},{{H}_{2}}O\] done
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B)
\[C{{O}_{2}},{{H}_{2}}O\] done
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C)
\[CO,C{{o}_{2}},{{H}_{2}}O\] done
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D)
\[C{{O}_{2}},{{N}_{2}},{{H}_{2}}O\] done
clear
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question_answer20)
The number and types of bonds between two carbon atoms in calcium carbide are
A)
One sigma, one pi done
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B)
One sigma, two pi done
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C)
Two sigma, one pi done
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D)
Two sigma, two pi done
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question_answer21)
The coordination number of A1 in the crystalline state of \[AlC{{l}_{3}}\] is _______.
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question_answer22)
Total no. of substance which contain hexagonal planer rings in their structures graphite, \[{{(BN)}_{x}},\]\[{{B}_{3}}{{N}_{3}}{{H}_{6}},\,{{C}_{6}}{{H}_{6}},\]\[{{B}_{2}}{{H}_{6}},{{H}_{3}}{{P}_{3}}{{O}_{9}}\]:
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question_answer23)
In borax (\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.\,10{{H}_{2}}O\]) the number\[B-O-B\]bonds is?
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question_answer24)
Total number of oxygen atoms(s) which act (s) as bridge between any two silicon atoms in a mineral with composition MM? \[S{{i}_{3}}{{P}_{x}}\](M=divalent metal ion and M?=tetravalent metal ion).
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question_answer25)
In the compound \[N{{a}_{2}}[{{B}_{4}}{{O}_{5}}{{(OH)}_{4}}].8{{H}_{2}}O,\]if the
(i) Number of \[B-O-B\]bonds is 'x' |
(ii) Number of \[B-B\]bonds is 'Y' |
(iii) Number of \[s{{p}^{2}}\]hybridized B atoms is 'Z' Calculate the value of \[x+y+z.\] |
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