In which of the following reactions conc. $H_{2} S O_{4}$ is used as an oxidising reagent?

C a F_{2} + H_{2} S O_{4} \to C a S O_{4} + 2 H F

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2 H I + H_{2} S O_{4} \to I_{2} + S O_{2} + 2 H_{2} O

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C u + 2 H_{2} S O_{4} \to C u S O_{4} + S O_{2} + 2 H_{2} O

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

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Solution

The correct options are
B $2 H I + H_{2} S O_{4} \to I_{2} + S O_{2} + 2 H_{2} O$
C $C u + 2 H_{2} S O_{4} \to C u S O_{4} + S O_{2} + 2 H_{2} O$
Among the above four (B) and (C) represent the oxidizing behavior of $H_{2} S O_{4}$ . In (B) reaction it oxidizes $H I$ and itself reduces to $S O_{2}$ oxidation state of central atom sulphur decreases from $+ 6$ to $+ 4$ . In (C) it oxidizes copper and itself gets reduced to $S O_{2}$

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H_{2} S O_{4}

Which of the following chemical reaction depicts the oxidizing behavior of $H_{2} S O_{4}$ ?

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2 A g + 2 H_{2} S O_{4} \to {A g}_{2} S O_{4} + 2 H_{2} O + S O_{2}

H_{2} S O_{4}

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