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Which of the following species is unable to act as an oxidising agent?

1. I⁻
2. S(s)
3. NO3⁻(aq)
4. Cr2O7²⁻

Correct answer: I⁻

Solution

I- has iodine in its lowest state (-1), so it cannot be reduced and cannot act as an oxidising agent (only as a reducing agent). Elemental S (0) can be reduced to S2-, so it can act as an oxidiser.

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