MCQ
Ammonia is liberated in the reaction of
- A$Mg_3N_2 + H_2O$
- B$NaNO_3 + Zn + NaOH$
- C$CaNCN + H_2O$
- ✓All of these
$\mathrm{NaNO}_{3}+4 \mathrm{Zn}+7 \mathrm{NaOH} \rightarrow$ $4 \mathrm{Na}_{2} \mathrm{ZnO}_{2}+\mathrm{NH}_{3}+2 \mathrm{H}_{2} \mathrm{O}$
$\mathrm{CaNCN}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CaCO}_{3}+2 \mathrm{NH}_{3}$
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$(i)$ A $0.5\,m$ $NaBr$ solution has a higher vapour pressure than a $0.5\,m\,BaCl_2$ solution at the same temperature
$(ii)$ Pure water freezes at the higher temperature than pure methanol
$(iii)$ a $0.1\,m\,NaOH$ solution freezes at a lower temperature than pure water
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