Question

The salt of the d block element that is used as a catalyst in the dissociation of the bleaching powder is

Answer 1

Hey dear,
Your question is rather irrelevant because dissociation of bleaching powder don't need a catalyst.

● Bleaching powder -
- Calcium hypochlorite Ca(OCl)2

● Dissociation of bleaching powder -
- Bleaching powder (calcium hypochlorite) reacts with water to form slaked lime (calcium hydroxide) and a byproduct (hypochlorous acid).
Ca(OCl)2 + 2H20 ---> Ca(OH)2 + 2HOCl

* The reaction doesn't involve use of a catalyst.

Hope this helps you.
Keep asking...

Answer 2

"The salt of the d block element that is used as a catalyst in the dissociation of the bleaching powder is cobalt chloride.

The molecular formula of bleaching powder is $Ca(ClO)_2.$

Bleaching powder is a salt form and it is a mixture of calcium chloride and calcium hypochlorite and the molecular formulas are $CH_3CH(OH)CH_3 and CH_3CH_2CHOHCH_3$ respectively.

In presence of d - block element such as cobalt in the form of cobalt chloride $(CoCl_2),$ the decomposition of the bleaching powder takes place.

Cobalt chloride bleaching powder dissociates into $CaCO_3 and O_3.$"