Question

Suresh took some sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube as shown in figure. When he brought a wet litmus paper near the test tube, then, he observed:

• A. no effect on litmus paper
• B. blue litmus turns red
• C. red litmus turns blue
• D. unpredictable

Answer 1

The correct option is B blue litmus turns red

$S+O_2\to S{O}_2\stackrel{H_{2}O}{\to }{H}_{2}S{O}_3$
Here, acid is formed which turns blue litmus red.