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Which substance serves as reducing agent in the following reaction?

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Which substance serves as reducing agent in the following reaction?

14H+ + Cr2O72- + 3Ni → 2Cr3+ + 7H2O + 3Ni2+

(a) H2O

(b) Ni

(c) H+

(d) Cr2O72-

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Correct answer: (b) Ni

Explanation:

(Ni → Ni2+) Ni loses electrons hence act as reducing agent.

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