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Properties of Water

Assertion :In...

Question

Assertion :In aqueous solution, $S O_{2}$ reacts with $H_{2} S$ liberating sulphur. Reason: $S O_{2}$ is an effective reducing agent.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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C

Assertion is correct but Reason is incorrect

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D

Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$S O_{2}$ can act both as an oxidising agent and a reducing agent but in this reaction, $S O_{2}$ is an oxidising agent and $H_{2} S$ is a reducing agent.
$S O_{2} + 2 H_{2} S ⟶ S + 2 H_{2} O$
$S^{2 -} ⟶ S + 2 e^{-}$ (Oxidation) (Reducing agent)
$4 e^{-} + S O_{2} ⟶ S$ (Reduction) (Oxidising agent)

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