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 figure below.

(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.

Explanation

(a) (i) There will be no action on dry litmus paper.
(ii) The colour of litums paper will turn red because sulphur is a non-metal and the oxides of non-metal are acidic in nature.
(iii) `S(s)+O_(2)(g)rarrSO_(2)(g)`