Question

when water is added to a white powder A vigorous reaction takes place and large amount of heat is released. 'A' is also used for whitewashing. Identify A write chemical equation for its reaction with water and name the product?

Answer 1

A is quick lime (Cao)
reaction= quick lime + water =slaked lime ...
I hope its helpful for you....

Answer 2

Answer: Compound A is quick lime (calcium oxide) and the product obtained is slaked lime (calcium hydroxide).

Explanation:

A white colored compound used for whitewashing is calcium oxide which is commonly known as quick lime. When it is reacted with water, it leads to the formation of calcium hydroxide which is commonly known as slaked lime.

The chemical equation for the reaction of quick lime with water follows:

$CaO(s)+H_2O(l)\rightarrow Ca(OH)_2(s)$

By Stoichiometry of the reaction:

1 mole of calcium oxide reacts with 1 mole of water to produce 1 mole of calcium hydroxide.

Hence, compound A is calcium oxide and the product formed is calcium hydroxide.