Question

When a metal X is treated with a dilute acid Y a gas Z is evolved. Find X Y and Z.

1) Name two acid which behaves like acid Y

2) Is reaction endothermic or exothermic

3) Is gas Z lighter or heavier than air?

Answer 1

1) The acids are -- 

(i) Hydrochloric acid (HCl) 

(ii) Sulphuric acid (H₂SO₄)

2) Exothermic.

3) The gas Z is lighter than air.