Hydrogen peroxide is best kept in a refrigerator. Why?
Because it is unstable with respect to disproportionation.........
And so we examine the BALANCED disproportionation reaction:
This reaction is kinetically slow, which is why we can store a bottle of hydrogen peroxide for a prolonged period; the decomposition will be slower at low temperature, and hence we store it in the fridge. Certain metal salts can dramatically increase the rate of the given reaction...........