Question

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

Answer 1

Answer:

When sulphur is heated in air it produce sulphur dioxide SO2

.

(a)(i) SO2

gas is neutral in nature and thus there will be no change in colour of dry litmus paper.

(ii) SO2

reacts with water to produce H2so3

sulphurous acid that being acid turns blue moist litmus red.

(b) S(s)+O2 (g)→SO2(g)

SO(g)+ h2O(aq)→H2so3(aq)