Question

Sulphur dioxide may be recognised by its:

• A. Characteristic pungent smell of burning sulphur
• B. Ability to turn dichromate paper green
• C. Ability to decolourize acidified $KMn{O}_4$ solution
• D. All of the above

Answer 1

Answer: (D)

All of the above

Sulphur dioxide may be recognized by its
(A)
Characteristic pungent smell of burning sulphur.
It has characteristic smell of rotten eggs.
(B)
Ability to turn dichromate paper green.
In acidic medium, $S{O}_2$ reduces potassium dichromate to green coloured chromic sulphate.
(C)
Ability to decolourize acidified $KMn{O}_4$
solution
In acidic medium, $S{O}_2$ reduces violet / purple colored potassium permangnate to manganese sulphate.