Give at least one example to explain the following properties:
$S O_{2}$ acts as a reducing agent

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Solution

As it can be oxidised to sulphuric acid, it acts as a reducing agent.
$S O_{2} \to H_{2} S O_{4}$

$C l_{2} + 2 H_{2} O + S O_{2} \to H_{2} S O_{4} + 2 H C l$

$2 F e C l_{3} + 2 H_{2} O + S O_{2} \to H_{2} S O_{4} + 2 F e C l_{2} + 2 H C l$

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