Question

An alkali metal $M$ reacts with air and products are hydrolysed. If gas obtained turns red litmus into blue then metal $M$ can be:

• A. $Li$
• B. $Na$
• C. $K$
• D. $Al$

Answer 1

The correct option is A $Li$

Lithium is very reactive and reacts with nitrogen of air to form nitride.
$Li+air\to L{i}_{3}N+L{i}_{2}O+L{i}_2{O}_2\downarrow H_{2}ON{H}_3+LiOH$
(Basic - turns red litmus into blue)