Multiple choice

The gas whose aqueous solution is strongly acidic in nature is

  1. ammonia

  2. phosphine

  3. sulphur dioxide

  4. hydrogen sulphide

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sulphur dioxide (SO2) reacts with water to form sulphurous acid (H2SO3), which is a strong acid in aqueous solution. Ammonia forms a basic solution, and hydrogen sulphide is a very weak acid.