Question

When $\text{MnO}_2$ and $\text{H}_2\text{SO}_4$ is added to a salt (A), the greenish yellow gas liberated as salt (A) is:

• A. $\text{NaBr}$
• B. $\text{CaI}_2$
• C. $\text{KNO}_3$
• D. $\text{NH}_4\text{Cl}$

Answer 1

Answer: (D)

$\text{NH}_4\text{Cl}$

Answer 2

The reaction involved is:
$2\text{NH}_4\text{Cl} + \text{MnO}_2 + 2\text{H}_2\text{SO}_4 \xrightarrow{\Delta} \text{MnSO}_4 + (\text{NH}_4)_2\text{SO}_4 + 2\text{H}_2\text{O} + \text{Cl}_2 \uparrow$
In this reaction, chlorine gas ($\text{Cl}_2$) is liberated, which has a greenish-yellow color.