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In the reaction below, which species acts as the reducing agent? 14H+ + Cr2O7^2− + 3Ni → 2Cr3+ + 7H2O + 3Ni2+

1. H2O
2. Ni
3. H+
4. Cr2O7^2−

Correct answer: Ni

Solution

Nickel (Ni) is the reducing agent because it donates electrons during the reaction, causing the chromium in Cr2O7^2− to be reduced to Cr3+. This electron transfer is characteristic of a reducing agent.

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