9
MCQ (Single Correct Answer)
The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to
A
ionic nature of lithium fluoride
B
high lattice enthalpy
C
high hydration enthalpy for lithium ion
D
low ionisation enthalpy of lithium atom
10
MCQ (Single Correct Answer)
Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?
A
$\mathrm{Be}(\mathrm{OH})_2$
B
$\mathrm{Mg}(\mathrm{OH})_2$
C
$\mathrm{Ca}(\mathrm{OH})_2$
D
$\mathrm{Ba}(\mathrm{OH})_2$
11
MCQ (Single Correct Answer)
In the synthesis of sodium carbonate, the recovery of ammonia is done by treating $\mathrm{NH}_4 \mathrm{Cl}$ with $\mathrm{Ca}(\mathrm{OH})_2$. The by-product obtained in this process is
A
$\mathrm{CaCl}_2$
B
NaCl
C
NaOH
D
$\mathrm{NaHCO}_3$
12
MCQ (Single Correct Answer)
When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
A
ammoniated electron
B
sodium ion
C
sodium amide
D
ammoniated sodium ion
13
MCQ (Single Correct Answer)
By adding gypsum to cement
A
setting time of cement becomes less
B
setting time of cement increases
C
colour of cement becomes light
D
shining surface is obtained