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For the redox reaction:Cr2O72−+H⊕+Ni⟶Cr3++Ni+2+H2OThe correct coefficients of the reactants for the balanced reaction are

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b

c

d

answer is A.

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14H⊕+6e−+Cr2O72−→ 2Cr3++7H2O 2x−14=−2 2x=6 2x=12 Ni→ Ni+2+2e-×314H⊕+CrO72−+3Ni→ 2Cr3++3Ni2++7H2O

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