Question

A substance X which is oxide of a metal is used extensively n cement industry. This is present in bones too on treatment with water ,it forms litmus blue . Identify X and write the chemical eqn involved

Answer 1

X is calcium hydroxide

bones have Calcium
when it reacts with water it forms calcium hydroxide which is a base and turns red litmus blue .

2Ca + 2H2O --------> 2Ca(OH)2