Question

($X$) $\underset{}{\overset{KOH}{\to }}$ ($Y$) (gas turns red litmus blue) + ($Z$) $\underset{}{\overset{Zn+KOH}{\to }}$ ($Y$) (gas).
($X$) $\underset{}{\overset{\Delta }{\to }}$ gas (does not support combustion)
Identify ($X$) to ($Z$).

• A. $X=N{H}_{4}N{O}_2,Y=N{H}_3,Z=KN{O}_2$
• B. $X=[N{H}_4{]}_{2}C{r}_2{O}_7,Y=N{H}_3,Z=C{r}_2{O}_3$
• C. $X=[N{H}_4{]}_{2}S{O}_4,Y=N{H}_3,Z=K_{2}S{O}_4$
• D. $X=N{H}_{4}N{O}_3,Y=N{H}_3,Z=KN{O}_3$

Answer 1

The correct option is B $X=[N{H}_4{]}_{2}C{r}_2{O}_7,Y=N{H}_3,Z=C{r}_2{O}_3$

Reactions are:
Ammonium dichromate reduce to $C{r}_2{O}_3$ in presence of KOH.

$[N{H}_4{]}_{2}C{r}_2{O}_7\stackrel{KOH}{\to }N{H}_3+C{r}_2{O}_3$

$[N{H}_4{]}_{2}C{r}_2{O}_7\to C{r}_2{O}_3+N_2+4H_{2}O$
$X=[N{H}_4{]}_{2}C{r}_2{O}_7,Y=N{H}_3,Z=C{r}_2{O}_3$
Option B is correct.