Question

3. An element A reacts with water to form a compound B which is used in white washing. The

compound B on heating forms an oxide which on treatment with water gives back B. Identify A, B

and C and give the reactions involved.

​

Answer 1

Answer:

A is CALCIUM which forms B (it is CALCIUM HYDROXIDE) when reacts with water, which is used in whitewashing

B (CALCIUM HYDROXIDE) on heating forms an oxide (It is CALCIUM OXIDE) which on treatment with water gives back B (CALCIUM HYDROXIDE)

Upto now must got ::

What is Compound A ---- it is CALCIUM

What is Compound B ---- it is CALCIUM HYDROXIDE

What is Compound C ---- it is CALCIUM OXIDE

Reaction :

Calcium Hydroxide (Ca(OH)2) ------- heat ------- Calcium Oxide (CaO) + Water

And vice versa