Q48 / 160 · JIPMER 2012 · Chemistry
For the reaction,
$\mathrm{NH}_3+\mathrm{OCl}^{-} \longrightarrow \mathrm{N}_2 \mathrm{H}_4+\mathrm{Cl}^{-}$
occurring in basic medium, the coefficient of $\mathrm{N}_2 \mathrm{H}_4$ in the balanced equation will be
- Correct answerA1
- B2
- C3
- D4
Solution
The two half-reactions for the given reaction are
$2 \mathrm{NH}_3 \longrightarrow \mathrm{N}_2 \mathrm{H}_4+2 \mathrm{H}^{+}+2 e^{-}$
$\mathrm{OCl}^{-}+2 \mathrm{H}^{+}+2 e^{-} \longrightarrow \mathrm{Cl}^{-}+\mathrm{H}_2 \mathrm{O}$
On adding both the reactions, we get
$2 \mathrm{NH}_3+\mathrm{OCl}^{-} \longrightarrow \mathrm{N}_2 \mathrm{H}_4+\mathrm{Cl}^{-}+\mathrm{H}_2 \mathrm{O}$
The obtained equation is a balanced equation and in it, the coefficient of $\mathrm{N}_2 \mathrm{H}_4$ is 1 .
Hence, the correct answer is option: 'A'.