In which of the following reactions does conc. $H_{2} S O_{4}$ act as an oxidising agent?

Z n O + H_{2} S O_{4}

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K B r + H_{2} S O_{4}

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N a C l + H_{2} S O_{4}

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None of these

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Solution

The correct option is D None of these
$Z n O + H_{2} S O_{4} \to Z n S O_{4} + H_{2} O$
$2 K B r + H_{2} S O_{4} \to K_{2} S O_{4} + 2 H B r$
$2 N a C l + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H C l$
In all these reaction the oxidation number of the elements in the compounds does not change and hence, $H_{2} S O_{4}$ does not act as an oxidising agent in the following reactions.
Hence, the correct answer is option (D).

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In which of the following reactions does conc.H2SO4 act as an oxidising agent?

In which of the following reactions does conc. $H_{2} S O_{4}$ act as an oxidising agent?