Which of the following can act as both oxidizing and reducing agent?
(i) $S O_{2}$ (ii) $H N O_{3}$ (iii) $H N O_{2}$ (iv) $H C l O_{4}$

S O_{2}, H N O_{2}

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H N O_{3}, H N O_{2}

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H N O_{2}, H C l O_{4}

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H C l O_{4}, S O_{2}

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Solution

The correct option is A $S O_{2}, H N O_{2}$
We know that, the highest and lowest possible oxidation states of N is +5 and -3 respectively. And the highest and lowest possible oxidation states of S is +6 and -2 respectively. And the highest and lowest possible oxidation states of Cl is +7 and -1 respectively.
In SO₂ , the oxidation state of sulphur is +4. Hence, it can undergo both oxidation and reduction.

In HNO₃ , the oxidation state of nitrogen is +5 which is the highest possible oxidation state of N. Hence, it can undergo only reduction.

In HNO₂ , the oxidation state of nitrogen is +3. Hence, it can undergo both oxidation and reduction.

Thus, option A is correct.

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