In the case of alkali metals, the covalent character decreases in the order:
A)
\[MF>MCl>MBr>MI\]
done
clear
B)
\[MF>MCl>MI>MBr\]
done
clear
C)
\[MI>MBr>MCl>MF\]
done
clear
D)
\[MCl>MI>MBr>MF\]
done
clear
View Answer play_arrow
The mobility of metal ions in aqueous medium \[(L{{i}^{+}},N{{a}^{+}},{{K}^{+}},R{{b}^{+}})\] in the electric field, follows the order
A)
\[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\]
done
clear
B)
\[R{{b}^{+}}>N{{a}^{+}}={{K}^{+}}>L{{i}^{+}}\]
done
clear
C)
\[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<R{{b}^{+}}\]
done
clear
D)
\[N{{a}^{+}}={{K}^{+}}>R{{b}^{+}}>L{{i}^{+}}\]
done
clear
View Answer play_arrow
The main oxides formed on combustion of \[Li,\text{ }Na\] and K in excess of air are, respectively:
A)
\[L{{i}_{2}}{{O}_{2}},N{{a}_{2}}{{O}_{2}}\] and \[K{{O}_{2}}\]
done
clear
B)
\[L{{i}_{2}}O,N{{a}_{2}}{{O}_{2}}\]and \[K{{O}_{2}}\]
done
clear
C)
\[L{{i}_{2}}O,N{{a}_{2}}O\] and \[K{{O}_{2}}\]
done
clear
D)
\[Li{{O}_{2}},N{{a}_{2}}{{O}_{2}}\]and \[{{K}_{2}}O\]
done
clear
View Answer play_arrow
Which of the following oxides of potassium is not known?
A)
\[{{K}_{2}}O\]
done
clear
B)
\[{{K}_{2}}{{O}_{4}}\]
done
clear
C)
\[K{{O}_{3}}\]
done
clear
D)
\[{{K}_{2}}{{O}_{3}}\]
done
clear
View Answer play_arrow
Nitrogen dioxide cannot be prepared by heating
A)
\[KN{{O}_{3}}\]
done
clear
B)
\[Pb{{(N{{O}_{3}})}_{2}}\]
done
clear
C)
\[Cu{{(N{{O}_{3}})}_{2}}\]
done
clear
D)
\[AgN{{O}_{3}}\]
done
clear
View Answer play_arrow
Incorrect statement is:
A)
\[NaHC{{O}_{3}}\] and \[KHC{{O}_{3}}\] have same crystal structure
done
clear
B)
On heating \[LiN{{O}_{3}}\] decomposes into \[L{{i}_{2}}O\] and \[N{{O}_{2}}\]
done
clear
C)
Among alkali metals, \[Li\]metal impart red colour to flame
done
clear
D)
\[L{{i}_{2}}S{{O}_{4}}\] does not form alum
done
clear
View Answer play_arrow
Which is not correctly matched
(i) Basic strength \[C{{s}_{2}}O<R{{b}_{2}}O<{{K}_{2}}O<N{{a}_{2}}O<L{{i}_{2}}O\] of oxides.
(ii) Stability of \[N{{a}_{2}}{{O}_{2}}<{{K}_{2}}{{O}_{2}}<R{{b}_{2}}{{O}_{2}}<C{{s}_{2}}{{O}_{2}}\] peroxides.
(iii) Stability of \[LiHC{{O}_{3}}<NaHC{{O}_{3}}<KHC{{O}_{3}}\] \[<RbHC{{O}_{3}}<CsHC{{O}_{3}}.\]
(iv) Melting point \[NaF<NaCl<NaBr<NaI\]
A)
(i) and (iv)
done
clear
B)
(i) and (iii)
done
clear
C)
(i) and (ii)
done
clear
D)
(ii) and (iii)
done
clear
View Answer play_arrow
The solubility order for alkali metal fluoride in water is:
A)
\[LiF<RbF<KF<NaF\]
done
clear
B)
\[RbF<KF<NaF<LiF\]
done
clear
C)
\[LiF>NaF>KF>RbF\]
done
clear
D)
\[LiF<NaF<KF<RbF\]
done
clear
View Answer play_arrow
Based on lattice energy and other considerations, which one of the following alkali metal chloride is expected to have the highest melting point?
A)
\[NaCl\]
done
clear
B)
\[KCl\]
done
clear
C)
\[LiCl\]
done
clear
D)
\[RbCl\]
done
clear
View Answer play_arrow
In crystals which one of the following ionic compounds would you expect maximum distance between centres of cations and anions?
A)
\[LiF\]
done
clear
B)
\[CsF\]
done
clear
C)
\[CsI\]
done
clear
D)
\[LiI\]
done
clear
View Answer play_arrow
Which of the following statements about\[N{{a}_{2}}{{O}_{2}}\], is not correct?
A)
It is diamagnetic in nature
done
clear
B)
It is derivative of \[{{H}_{2}}{{O}_{2}}\]
done
clear
C)
\[N{{a}_{2}}{{O}_{2}}\] oxidises \[C{{r}^{3+}}\] to \[CrO_{4}^{2-}\]in acid medium.
done
clear
D)
It is the super oxide of sodium
done
clear
View Answer play_arrow
The correct order of thermal stability of hydroxides is:
A)
\[Ba{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Mg{{(OH)}_{2}}\]
done
clear
B)
\[Mg{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Ba{{(OH)}_{2}}\]
done
clear
C)
\[Mg{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ba{{(OH)}_{2}}\]
done
clear
D)
\[Ba{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Mg{{(OH)}_{2}}\]
done
clear
View Answer play_arrow
The reducing power of a metal depends on various factors. Suggest the factor which makes \[Li\]metal the strongest reducing agent in aqueous solution:
A)
Sublimation enthalpy
done
clear
B)
Ionisation enthalpy
done
clear
C)
Hydration enthalpy
done
clear
D)
Electron-gain enthalpy
done
clear
View Answer play_arrow
Select the correct statements :
I. \[C{{s}^{+}}\] is more highly hydrated than the other alkali metal ions II. Among the alkali metals \[Li,\text{ }Na,\text{ }K\]and \[Rb,\]lithium has the highest melting point III. Among the alkali metals, only lithium forms a stable nitride by direct combination with nitrogen
A)
I, II and III
done
clear
B)
I and II
done
clear
C)
I and III
done
clear
D)
II and III
done
clear
View Answer play_arrow
In the following sequence of reaction, identify the compounds (A), (B) (C) and (D): \[\underset{Solution}{\mathop{N{{a}_{2}}C{{O}_{3}}}}\,\xrightarrow{S{{O}_{2}}}(A)\xrightarrow{N{{a}_{2}}C{{O}_{3}}}\] \[(B)\xrightarrow[Heat]{S}(C)\xrightarrow{AgN{{O}_{3}}}(D)\]
A)
\[N{{a}_{2}}S{{O}_{3}},NaHS{{O}_{3}},N{{a}_{2}}S,A{{g}_{2}}S\]
done
clear
B)
\[NaHS{{O}_{3}},N{{a}_{2}}S{{O}_{3}},N{{a}_{2}}{{S}_{2}}{{O}_{3}},A{{g}_{2}}S\]
done
clear
C)
\[NaHS{{O}_{3}},N{{a}_{2}}S{{O}_{4}},N{{a}_{2}}S,A{{g}_{2}}O\]
done
clear
D)
\[N{{a}_{2}}S{{O}_{3}},N{{a}_{2}}S{{O}_{4}},N{{a}_{2}}{{S}_{2}}{{O}_{3}},Ag\]
done
clear
View Answer play_arrow
Which of the following does not illustrate the anomalous properties of lithium?
A)
The melting point and boiling point of\[~Li\] are comparatively high
done
clear
B)
\[~Li\] is much softer than the other group I metals
done
clear
C)
\[~Li\] forms a nitride \[~L{{i}_{3}}N\] unlike group I metals
done
clear
D)
The ion of \[~Li\] and its compounds are more heavily hydrated than those of the rest of the group
done
clear
View Answer play_arrow
The order solubility in water of alkaline earth metal sulphates down the group is\[Be>Mg>Ca>Sr>Ba\]. This is due to increases in
A)
ionization energy
done
clear
B)
melting point
done
clear
C)
coordination number
done
clear
D)
All of these
done
clear
View Answer play_arrow
A chloride dissolves appreciably in cold water. When placed on a Pt wire in bunsen flame, no distinctive colour is noted. Which cation could be present?
A)
\[B{{e}^{2+}}\]
done
clear
B)
\[B{{a}^{2+}}\]
done
clear
C)
\[P{{b}^{2+}}\]
done
clear
D)
\[C{{a}^{2+}}\]
done
clear
View Answer play_arrow
An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions :
(a) It gives a white turbidity with dilute \[HCl\] solution (b) It decolourises a solution of iodine in potassium iodide (c) It gives a white precipitate with silver nitrate solution which turns black on standing.
Identify the compound (X)
A)
\[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\]
done
clear
B)
\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O\]
done
clear
C)
\[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\]
done
clear
D)
None of these
done
clear
View Answer play_arrow
A metal M readily forms its sulphate \[MS{{O}_{4}}\]which is water-soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hyroxide \[M{{(OH)}_{2}}\], which is soluble in \[NaOH\]solution. Then M is
A)
\[Mg\]
done
clear
B)
\[Ba\]
done
clear
C)
\[Ca\]
done
clear
D)
\[Be\]
done
clear
View Answer play_arrow
Melting point of calcium halides decreases in the order
A)
\[Ca{{F}_{2}}>CaC{{l}_{2}}>CaB{{r}_{2}}>Ca{{I}_{2}}\]
done
clear
B)
\[Ca{{I}_{2}}>CaB{{r}_{2}}>CaC{{l}_{2}}>Ca{{F}_{2}}\]
done
clear
C)
\[CaB{{r}_{2}}>Ca{{I}_{2}}>Ca{{F}_{2}}>CaC{{l}_{2}}\]
done
clear
D)
\[CaC{{l}_{2}}>CaB{{r}_{2}}>Ca{{I}_{2}}>Ca{{F}_{2}}\]
done
clear
View Answer play_arrow
Which of the following is not correct?
A)
\[2L{{i}_{2}}O\xrightarrow[673K]{heat}L{{i}_{2}}{{O}_{2}}+2Li\]
done
clear
B)
\[2{{K}_{2}}O\xrightarrow[673K]{heat}{{K}_{2}}{{O}_{2}}+2K\]
done
clear
C)
\[2N{{a}_{2}}O\xrightarrow[673K]{heat}N{{a}_{2}}{{O}_{2}}+2Na\]
done
clear
D)
\[2Rb{{O}_{2}}\xrightarrow[673K]{heat}R{{b}_{2}}{{O}_{2}}+2Rb\]
done
clear
View Answer play_arrow
The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?
A)
\[CsH>RbH>KH>NaH>LiH\]
done
clear
B)
\[KH>NaH>LiH>CsH>RbH\]
done
clear
C)
\[NaH>LiH>KH>RbH>CsH\]
done
clear
D)
\[LiH>NaH>KH>RbH>CsH\]
done
clear
View Answer play_arrow
Which of the following is not correct about the solution when moderate amount of sodium metal is dissolved in liquid ammonia at low temperature?
A)
\[N{{a}^{+}}\] ions are produced in solution
done
clear
B)
We get a blue coloured solution
done
clear
C)
the solution acts as a good conductor of electricity
done
clear
D)
Liquid ammonia remains diamagnetic
done
clear
View Answer play_arrow
The order of solubility of lithium halides in nonpolar solvents follows the order
A)
\[LiI>LiBr>LiCl>LiF\]
done
clear
B)
\[LiF>LiI>LiBr>LiCl\]
done
clear
C)
\[LiCl>LiF>LiI>LiBr\]
done
clear
D)
\[LiBr>LiCl>LiF>LiI\]
done
clear
View Answer play_arrow
Which of the following is most stable?
A)
\[N{{a}_{3}}N\]
done
clear
B)
\[L{{i}_{3}}N\]
done
clear
C)
\[{{K}_{3}}N\]
done
clear
D)
\[R{{b}_{3}}N\]
done
clear
View Answer play_arrow
\[ZnC{{l}_{2}}+NaHC{{O}_{3}}\xrightarrow{Heat}(A)\xrightarrow{Heat}\] \[(B)+(C){{H}_{2}}O(B)+NaOH\to (D)\] Identify the compound (D) present in the solution.
A)
\[ZnC{{O}_{3}}\]
done
clear
B)
\[Zn{{(OH)}_{2}}\]
done
clear
C)
\[ZnO\]
done
clear
D)
\[N{{a}_{2}}Zn{{O}_{2}}\]
done
clear
View Answer play_arrow
Which of the following has correct increasing basic strength?
A)
\[MgO<BeO<CaO<BaO\]
done
clear
B)
\[BeO<MgO<CaO<BaO\]
done
clear
C)
\[BaO<CaO<MgO<BeO\]
done
clear
D)
\[CaO<BaO<BeO<MgO\]
done
clear
View Answer play_arrow
Which of the following statement is false?
A)
Strontium decomposes water readily than beryllium.
done
clear
B)
Barium carbonate melts at a higher temperature than calcium carbonate.
done
clear
C)
Barium hydroxide is more soluble in water than magnesium hydroxide.
done
clear
D)
Beryllium hydroxide is more basic than barium hydroxide.
done
clear
View Answer play_arrow
Which of the following is the best method for preparation of \[Be{{F}_{2}}\]?
A)
Reaction of \[Be\] with \[{{F}_{2}}\]
done
clear
B)
Thermal decomposition of \[{{(N{{H}_{4}})}_{2}}Be{{F}_{4}}\]
done
clear
C)
Reaction of \[Be\]with \[HF\]
done
clear
D)
All of the above are equally effective
done
clear
View Answer play_arrow
Aqueous solution of a group 2 element is precipitated by adding \[N{{a}_{2}}C{{O}_{3}},\] then this precipitate is tested on flame, no light in visible region is observed , this element can be
A)
\[Ba\]
done
clear
B)
\[Mg\]
done
clear
C)
\[Ca\]
done
clear
D)
\[Sr\]
done
clear
View Answer play_arrow
Which or me following are found in biological fluids \[N{{a}^{+}},M{{g}^{2+}},C{{a}^{2+}},{{K}^{+}},S{{r}^{2+}},L{{i}^{+}}\] and \[B{{a}^{2+}}\]?
A)
\[M{{g}^{2+}},C{{a}^{2+}},\] and \[S{{r}^{2+}}\]
done
clear
B)
\[N{{a}^{2+}}\] and \[{{K}^{+}}\]
done
clear
C)
\[N{{a}^{+}},{{K}^{+}},M{{g}^{2+}}\]and \[C{{a}^{2+}}\]
done
clear
D)
\[S{{r}^{+}},Li\]and \[B{{a}^{2+}}\]
done
clear
View Answer play_arrow
Metallic magnesium is prepared by
A)
reduction of \[MgO\]by coke.
done
clear
B)
electrolysis of aqueous solution of \[Mg{{(N{{O}_{3}})}_{2}}.\]
done
clear
C)
displacement of \[Mg\]by iron from \[MgS{{O}_{4}}\] solution.
done
clear
D)
electrolysis of molten \[MgC{{l}_{2}}\]
done
clear
View Answer play_arrow
A compound (A) is used in preparation of washing soda to recover ammonia in Solvay's process. When\[C{{O}_{2}}\]. is bubbled through an aqueous solution of (A), the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?
A)
\[Ca{{(HC{{O}_{3}})}_{2}}\]
done
clear
B)
\[CaO\]
done
clear
C)
\[Ca{{(OH)}_{2}}\]
done
clear
D)
\[CaC{{O}_{3}}\]
done
clear
View Answer play_arrow
\[Be{{F}_{2}}\] is soluble in water whereas fluorides of other alkaline earth metals are insoluble because of
A)
ionic nature of \[Be{{F}_{2}}\].
done
clear
B)
covalent nature of \[Be{{F}_{2}}\].
done
clear
C)
greater hydration energy of \[B{{e}^{2+}}\] ion as compared to its lattice energy.
done
clear
D)
none of these.
done
clear
View Answer play_arrow
Which category of salts of alkaline earth metals is not found in solid sate, but found in solution state?
A)
Carbonates
done
clear
B)
Bicarbonates
done
clear
C)
Hydroxides
done
clear
D)
Sulphates
done
clear
View Answer play_arrow
Sodium carbonate solution in water is alkaline due to
A)
hydrolysis of \[N{{a}^{+}}\]
done
clear
B)
hydrolysis of \[CO_{3}^{2-}\]
done
clear
C)
hydrolysis of both \[N{{a}^{+}}\] and \[CO_{3}^{2-}\] ions
done
clear
D)
None of these
done
clear
View Answer play_arrow
When a crystal of caustic soda is exposed to air, a liquid layer is deposited because :
A)
Crystal loses water
done
clear
B)
Crystal absorbs moisture and \[C{{O}_{2}}\]
done
clear
C)
Crystal melts
done
clear
D)
Crystal sublimes
done
clear
View Answer play_arrow
Which of me following statements is correct for\[CsBr\]?
A)
It is a covalent compound.
done
clear
B)
It contains \[C{{s}^{3+}}\] and \[B{{r}^{-}}\] ions.
done
clear
C)
It contains \[C{{s}^{+}}\] and \[B{{r}_{3}}^{-}\] ions
done
clear
D)
It contains \[C{{s}^{+}},\] and \[B{{r}^{-}}\] and lattice \[B{{r}_{2}}\] molecule.
done
clear
View Answer play_arrow
The pair of compounds which cannot exits together in solution is
A)
\[NaHC{{O}_{3}}\]and \[NaOH\]
done
clear
B)
\[N{{a}_{2}}C{{O}_{3}}\]and \[NaHC{{O}_{3}}\]
done
clear
C)
\[N{{a}_{2}}C{{O}_{3}}\]and\[NaOH\]
done
clear
D)
\[NaHC{{O}_{3}}\]and \[NaCl\]
done
clear
View Answer play_arrow
\[N{{a}_{2}}S{{O}_{3}}\] and \[NaHC{{O}_{3}}\] may be distinguished by treating their aqueous solution with :
A)
\[MgO\]
done
clear
B)
\[MgS{{O}_{4}}\]
done
clear
C)
litmus solution,
done
clear
D)
dil.acid
done
clear
View Answer play_arrow
Substance which absorbs \[C{{O}_{2}},\] and violently reacts with \[{{H}_{2}}O\] with sound is :
A)
\[{{H}_{2}}S{{O}_{4}}\]
done
clear
B)
\[CaC{{O}_{3}}\]
done
clear
C)
\[ZnO\]
done
clear
D)
\[CaO\]
done
clear
View Answer play_arrow
When sulphur is heated with \[NaOH\,(aq)\]. The compounds formed are
A)
\[N{{a}_{2}}S+{{H}_{2}}O\]
done
clear
B)
\[N{{a}_{2}}S{{O}_{3}}+{{H}_{2}}O\]
done
clear
C)
\[N{{a}_{2}}S+N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\]
done
clear
D)
\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\]
done
clear
View Answer play_arrow
The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid from which hydrogen is released on treatment with water. The metal is:
A)
\[Ca\]
done
clear
B)
\[Al\]
done
clear
C)
\[Zn\]
done
clear
D)
\[Cu\]
done
clear
View Answer play_arrow
Acidified solution of sodium thiosulphate is unstable because in thiosulphate
A)
the sulphur atoms are at unstable oxidation state of \[+2\]
done
clear
B)
the two sulphur atoms are at different oxidation states of \[+6\] and \[-2\]
done
clear
C)
the \[S-S\] bond are unstable bonds.
done
clear
D)
sulphur is in zero oxidation state.
done
clear
View Answer play_arrow
Two metals (A) and (B) belong to the same group of the periodic table. Metal (A) forms an insoluble oxide but a soluble sulphate, metal (B) forms a soluble oxide but an insoluble sulphate. Both metals (A) and (B) form hydroxides which are soluble m alkalis, (A) and (B) are
A)
\[Ba\] and \[Mg\]
done
clear
B)
\[Na\] and \[K\]
done
clear
C)
\[Mg\] and \[Ba\]
done
clear
D)
\[K\] and \[Rb\]
done
clear
View Answer play_arrow
Among the given statements, the incorrect one is
A)
\[Be\] differs much from other alkali metals than \[Li\] does from other alkali metals.
done
clear
B)
\[Be\] generally forms covalent compounds
done
clear
C)
\[Be\] forms a very strong complex \[{{[Be{{({{H}_{2}}O)}_{4}}]}^{2+}}\].
done
clear
D)
\[Be\] usually has more than four water of crystallisation associated with it.
done
clear
View Answer play_arrow
Calcium imide on hydrolysis gives gas (B) which on oxidation by bleaching powder gives gas (C Gas (C) on reaction with magnesium give compound (D) which on hydrolysis gives agar gas (B). Identify (B), (C) and (D).
A)
\[N{{H}_{3}},{{N}_{2}},M{{g}_{3}}{{N}_{2}}\]
done
clear
B)
\[{{N}_{2}},N{{H}_{3}},MgNH\]
done
clear
C)
\[{{N}_{2}},{{N}_{2}}{{O}_{5}},Mg{{(N{{O}_{3}})}_{2}}\]
done
clear
D)
\[N{{H}_{3}},N{{O}_{2}},Mg{{(N{{O}_{2}})}_{2}}\]
done
clear
View Answer play_arrow
Which one is the correct statement with reference to solubility of \[MgS{{O}_{4}}\] in water?
A)
\[S{{O}_{4}}^{2-}\] ion mainly contributes towards hydration energy.
done
clear
B)
Sizes of \[M{{g}^{2+}}\] and \[S{{O}_{4}}^{2-}\] are similar.
done
clear
C)
Hydration energy of \[MgS{{O}_{4}}\] is higher in comparison to its lattice energy.
done
clear
D)
Ionic potential (charge/radius ratio) of \[M{{g}^{2+}}\]is very low.
done
clear
View Answer play_arrow
A solid compound 'X' on heating gives \[C{{O}_{2}}\]gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of CO,., through 'Y' water, a clear solution 'Z', is obtained. On boil. 'Z', compound "X' is reformed. The compound 'X' is
A)
\[Ca{{(HC{{O}_{3}})}_{2}}\]
done
clear
B)
\[CaC{{O}_{3}}\]
done
clear
C)
\[N{{a}_{2}}C{{O}_{3}}\]
done
clear
D)
\[{{K}_{2}}C{{O}_{3}}\]
done
clear
View Answer play_arrow
Amongst the following hydroxides, the one which has the lowest value of K is :
A)
\[Ca{{(OH)}_{2}}\]
done
clear
B)
\[Mg{{(OH)}_{2}}\]
done
clear
C)
\[Be{{(OH)}_{2}}\]
done
clear
D)
\[Ba{{(OH)}_{2}}\]
done
clear
View Answer play_arrow
For which one of the following minerals. The composition given is incorrect?
A)
Soda ash - \[(N{{a}_{2}}C{{O}_{3}})\]
done
clear
B)
Camallite - \[(KCl,MgC{{l}_{2}},6{{H}_{2}}O)\]
done
clear
C)
Borax - \[(N{{a}_{2}}{{B}_{4}}{{O}_{7}},7{{H}_{2}}O)\]
done
clear
D)
Glauber's salt - \[(N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O)\]
done
clear
View Answer play_arrow
The difference of number of water molecules in gypsum and plaster of Paris is
A)
\[\frac{5}{1}\]
done
clear
B)
2
done
clear
C)
\[1/2\]
done
clear
D)
\[1\frac{1}{2}\]
done
clear
View Answer play_arrow
Which is not obtained when metal carbides react with \[{{H}_{2}}O\]?
A)
\[A{{l}_{4}}{{C}_{3}}+{{H}_{2}}O\xrightarrow{{}}CH\equiv CH\]
done
clear
B)
\[Ca{{C}_{2}}+{{H}_{2}}O\xrightarrow{{}}CH\equiv CH\]
done
clear
C)
\[M{{g}_{4}}{{C}_{3}}+{{H}_{2}}O\xrightarrow{{}}C{{H}_{3}}C\equiv CH\]
done
clear
D)
\[B{{e}_{2}}C+{{H}_{2}}O\xrightarrow{{}}C{{H}_{4}}\]
done
clear
View Answer play_arrow
\[CaC{{l}_{2}}\] is preferred over \[NaCl\] for clearing ice on roads particularly in very cold countries. This is because:
A)
\[CaC{{l}_{2}}\]is less soluble in \[{{H}_{2}}O\] than \[NaCl\]
done
clear
B)
\[CaC{{l}_{2}}\] is hygroscopic but \[NaCl\]is not
done
clear
C)
Eutectic mixture of \[CaC{{l}_{2}}/{{H}_{2}}O\] freezes at \[-55{}^\circ C\] while that of \[NaCl/{{H}_{2}}O\] freezes at \[-18{}^\circ C\]
done
clear
D)
\[NaCl\] makes the road slipperty but \[CaC{{l}_{2}}\] does not
done
clear
View Answer play_arrow
Which of the following statement about the sulphate of alkali metal is correct?
A)
Except \[L{{i}_{2}}S{{O}_{4}}\] all sulphate of other alkali metals are soluble in water
done
clear
B)
All sulphate salts of alkali metals except lithium sulphate forms alum.
done
clear
C)
All sulphate salts of alkali metals except lithium sulphate do not decompose at high. Temperature
done
clear
D)
All of the above
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\[M{{g}_{2}}{{C}_{3}}\] reacts with water forming propyne gas \[C_{3}^{4-}\] ions has:
A)
two sigma and two pi bonds
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B)
three sigma and one pi bond
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C)
two sigma and one pi bond
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D)
two sigma and three pi bonds
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If \[NaOH\]is added to an aqueous solution of \[Z{{n}^{2+}}\] ions, a white precipitate appears and on adding excess \[NaOH,\]the precipitate dissolves. In this solution zinc exists in the:
A)
both in cafionic and anionic parts
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B)
there is no zinc left in the solution
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C)
cationic part
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D)
anionic part.
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Which is incorrect statement?
A)
The heats of hydration of the dipositive alkaline earth metal decrease with an increase in their ionic size
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B)
\[NaN{{O}_{3}}\] forms \[N{{a}_{2}}{{O}_{2}}\] on heating
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C)
Hydration of alkali metal ion is less than that of IIA group
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D)
Alkaline earth metal ions, because of their much larger charge to size ratio, exert a much stronger electrostatic attraction on the oxygen of water molecule surrounding them
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Which of the following does not form an oxide on heating?
A)
\[ZnC{{O}_{3}}\]
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B)
\[CaC{{O}_{3}}\]
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C)
\[L{{i}_{2}}C{{O}_{3}}\]
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D)
\[N{{a}_{2}}C{{O}_{3}}\]
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