Question

Decomposition of ${H_2}{O_2}$ is prevented by adding:
A.NaOH
B. $Mn{O_2}$
C.Acetanilide
D.Carbon powder

Answer 1

Several negative catalysts used to prevent decomposition of ${H_2}{O_2}$ and they also play a role as stabilizers of ${H_2}{O_2}$ . Silica, Manganese dioxide, Iron and Alumina are the substance which causes rapid decomposition.

Complete step by step answer:
The molecular formula of hydrogen peroxide is ${H_2}{O_2}$ . Hydrogen peroxide is unstable and will decompose.
The decomposition reaction of ${H_2}{O_2}$ is given as below:
$2{H_2}{O_2} \to 2{H_2}O + {O_2}$
As we see, it will decompose in water and oxygen.
When exposed to heat and light, it has been decomposed. So we kept it in a cool place and kept it in a dark colour bottle.
${H_2}{O_2}$ oxidizes by releasing an oxygen atom as a free radical because ${H_2}{O_2}$ is an oxidizing agent.
When sodium hydroxide and hydrogen peroxide react with each other, it produces sodium peroxide which is a strong stabilizer. It is an exothermic mist from high temperatures and heat from the decomposition causing thermal hazards.
Manganese oxide is a very rapid catalyst and exothermic to decompose ${H_2}{O_2}$ .
Acetanilide is a negative catalyst which prevents decomposition of ${H_2}{O_2}$ .
Other substances are positive catalysts which are used to rapidly decompose. Hydrogen peroxide is decomposed by only a negative catalyst which acts as stabilizers.

So, the correct answer is option (C).

Note:
${H_2}{O_2}$ also known as a bleaching agent and it has oxidizing nature. It will break down exposure to UV light. Hydrogen peroxide is not stored in a glass bottle, because glass contains alkali metal and hydrogen peroxide reacts with alkali metal oxide.