MCQ
Hydroxide soluble in ammonia is
- A$Al{(OH)_3}$
- B$Fe{(OH)_3}$
- C$Cr{(OH)_3}$
- ✓$Cu{(OH)_2}$
$Cu{(OH)_2} + 4N{H_3}\, \to \,[Cu{(N{H_3})_4}]{(OH)_2}$
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(nearest integer)
[Given : Molar mass of $\mathrm{AB}_2=200 \mathrm{~g} \mathrm{~mol}^{-1} \cdot \mathrm{K}_{\mathrm{b}}$
(molal boiling point elevation const. of water)
$=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, boiling point of water $=100^{\circ} \mathrm{C}$;
$\mathrm{AB}_2$ ionises as $\left.\mathrm{AB}_2 \rightarrow \mathrm{A}^{2+}+2 \mathrm{~B}^{-}\right]$