Question

Why is Maganese dioxide be used for preparation of oxygen gas from hudroxide

Answer 1

Explanation:

Manganese dioxide acts as a catalyst for the reaction. The oxygen produced in all these cases relights a glowing splint.

Answer 2

Answer:

$\huge\mathrm\pink{Answer}$

Manganese dioxide acts as a catalyst for the reaction. The oxygen produced in all these cases relights a glowing splint.