When S reacts with H2SO4, a colourless gas with pungent odour evolves which acts as a mild bleaching agent in the presence of moisture. Identify the gas and explain its bleaching action.
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When S reacts with H2SO4, a pungent, colorless gas is evolved as follows:
S + 2H2SO4------ 3SO2 + 2H2O
The pungent gas formed is sulfur dioxide
Sulfur dioxide is a temporary bleaching agent. It removes oxygen from the colored substances, making them colourless. However, the atmospheric oxygen replace the oxygen that is removed from the fabric, which allows it to slowly regain its colour again.
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