Which of the following substances can act as only reducing agent?

Sulphur

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Hydrogen sulphide

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S O_{2}

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S O_{3}

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Solution

The correct option is B Hydrogen sulphide
In $H_{2} S$ , $S$ is in its lowest oxidation state that is $- I I$ . Hence, it can only act as a reducing agent.

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H_{2} S

S O_{2}

$H_{2} S$ acts only as a reducing agent while $S O_{2}$ can act both as a reducing and oxidizing agent because

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