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Which substance serves as a reducing agent in the following reaction? 14H⁺ + Cr2O7²⁻ + 3Ni → 2Cr³⁺ + 7H2O + 3Ni²⁺

1. H2O
2. Ni
3. H⁺
4. Cr2O7²⁻

Correct answer: Ni

Solution

Nickel (Ni) is oxidized to Ni²⁺ in the reaction, meaning it loses electrons and thus acts as the reducing agent by donating electrons to reduce Cr2O7²⁻ to Cr³⁺.

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