MCQ
A hydride of nitrogen which is acidic is
- A$N{H_3}$
- B${N_2}{H_2}$
- ✓${N_3}H$
- D${N_2}{H_4}$
${N_3}H \to {H^ + } + N_3^ - $
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$(I)$ $CrO_4^{2-}$
$(II)$ $MnO_4^-$
$(III)$ $Cr_2O_7^{2-}$ ?

Assertion $(A)$ : $\mathrm{PH}_3$ has lower boiling point than $\mathrm{NH}_3$.
Reason $(R)$ : In liquid state $\mathrm{NH}_3$ molecules are associated through vander waal's forces, but $\mathrm{PH}_3$ molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below: