7
MCQ (Single Correct Answer)
Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is
A
$\mathrm{BeCl}_2$
B
$\mathrm{MgCl}_2$
C
$\mathrm{CaCl}_2$
D
$\mathrm{SrCl}_2$
8
MCQ (Single Correct Answer)
The order of decreasing ionisation enthalpy in alkali metals is
A
$\mathrm{Na}>\mathrm{Li}>\mathrm{K}>\mathrm{Rb}$
B
$\mathrm{Rb}<\mathrm{Na}<\mathrm{K}<\mathrm{Li}$
C
$\mathrm{Li}>\mathrm{Na}>\mathrm{K}>\mathrm{Rb}$
D
$\mathrm{K}<\mathrm{Li}<\mathrm{Na}<\mathrm{Rb}$
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
$\mathrm{NaHCO}_3$