Which colourless gas evolves, when $\mathrm{NH}_{4} \mathrm{Cl}$ reacts with zinc in a dry cell battery

Which colourless gas evolves, when $\mathrm{NH}_{4} \mathrm{Cl}$ reacts with zinc in a dry cell battery
  1. $\mathrm{NH}_{4}$
  2. $\mathrm{N}_{2}$
  3. $\mathrm{H}_{2}$
  4. $\mathrm{Cl}_{2}$

Solution

$2 \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{Zn} ightarrow 2 \mathrm{NH}_{3}+\mathrm{ZnCl}_{2}+\mathrm{H}_{2} \uparrow$.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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