In which of the following reactions, the oxidation state of non-metal increases by maximum number of units when they react-with hot conc. $H N O_{3}$ ?

Carbon

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Phosphorus

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Sulphur

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Iodine

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Solution

The correct option is B Sulphur
$H N O_{3}$ on reaction with Sulphur produces $H_{2} S O_{4}$ .
In $H_{2} S O_{4}$ , the oxidation number of sulphur is +6. In this reaction the oxidation state of sulphur changes from 0 to +6.
In all other reaction, the oxidation number does not increase to such extent. thus sulphur is the correct answer.

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