Question

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it.
(a) What will be the action of gas on (i) dry litmus paper? (ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place

Answer 1

(a) When sulphur is heated in air, sulphur dioxide gas is formed.
(i) Sulphur dioxide has no action on dry litmus paper.
(ii) Sulphur dioxide turns blue litmus paper to red.
(b) S(s) +O₂(g) +SO₂(g)
Sulphur     Orygen       Sulphur dioxide