Question

 A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.
(a) CaOCl2
(b) Ca (OH)2
(c) CaO
(d) CaCO3​

Answer 1

Answer:

c) CaO , calcium oxide is the right ans.

Explanation:

Hope! it's going to help you..

Answer 2

Answer:

Here you go

(c) CaO

Explanation:

Calcium oxide is used in white washing by dissolving it in water forming calcium hydroxide {Ca(OH)2}.