A moist litmus paper is introduced in a gas jar containing a gas. After sometime the paper becomes colourless. The gas present in the jar is ? (1.hydrogen2.Carbon dioxide 3.Sulphur Dioxide 4.Ammonia) Why?
The gas present in jar is Sulphur dioxide.
Hence option 3. is correct.
This is due to bleaching action of SO2. In presence of moisture following reaction takes place,
SO2 + 2H2O → H2SO4 + 2H
The nascent hydrogen bleaches colouring matter to colourless.
Colouring matter + [H] → Colourless matter
Hence option 3. is correct.
This is due to bleaching action of SO2. In presence of moisture following reaction takes place,
SO2 + 2H2O → H2SO4 + 2H
The nascent hydrogen bleaches colouring matter to colourless.
Colouring matter + [H] → Colourless matter