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COMEDK2024ChemistryRedox Reactions

When a colourless gas is passed through bromine water only decolourisation take place. The gas is

Options

  1. ASO ₂
  2. BHBr
  3. CHCl
  4. DH ₂ ~S

Correct answer

A. SO ₂

Step-by-step solution

Bromine water is an oxidising agent. It oxidises SO ₂ to SO ₃ and itself get reduced to colourless HBr . aligned & Orange red Br ₂ + H ₂ O Colourless 2 HBr +[ O ] & Colourless SO ₂ +[ O ] SO ₃ & H ₂ O + SO ₃ H ₂ SO ₄ aligned H ₂ ~S is also oxidised by bromine water but in this case, decolourisation is also accompanied by formation of sulphur.

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