Which of the following will oxidize sulphur directly to sulphuric acid?

Hot and dilute nitric acid.

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Hot and conc. nitric acid.

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Hot and conc. nitrous acid.

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Hot and dilute. nitrous acid.

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Solution

The correct option is B
Hot and conc. nitric acid.

Sulphur reacts with hot concentrated nitric acid to form its own acid as one of the products.
$S + 6 H N O_{3} \to H_{2} S O_{4} + 2 H_{2} O + 6 N O_{2}$
Thus nitric acid is used in the preparation of sulphuric acid.

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