Question

$H_2{O}_2$ involves in the reaction as an oxidising agent, when it is added to:

• A. $CaOC{l}_2$
• B. $O_3$
• C. $A{g}_{2}O$
• D. $KI$

Answer 1

The correct option is D $KI$

$H_2{O}_2$ has oxygen in $-1$ oxidation state, which implies it can go to $-2$ as well as $0$ oxidation state. When it acts as an oxidising agent, itself reduces its oxygen to $-2$ state, thereby mostly producing water.

$KI$ is a good reducing agent where it is easily oxidisable to Iodine.

Reaction: $KI+H_2{O}_2⟶I_2+2KOH$.

Therefore, $H_2{O}_2$ acts as an oxidising agent in the presence of $KI$.