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The standard reduction potentials at 298 K for single electrodes are given below. Electrode electrode potential (volt) Mg 2+ /Mg − 2 .34 Zn 2+ /Zn − 0 .76 Fe 2+ /Fe − 0 .44 From this we can tell that

Options

  1. AZn can reduce both M g 2 + and F e 2 +
  2. BFe can reduce both M g 2 + and Z n 2 +
  3. CMg can reduce both Z n 2 + and F e 2 +
  4. DMg can reduce Z n 2 + but not F e 2 +

Correct answer

C. Mg can reduce both Z n 2 + and F e 2 +

Step-by-step solution

Metals with lower SRP can displace the metal with higher SRP from their solutions. Mg with lower SRP (-2.34) can reduce both Z n 2 + (-0.76) and F e 2 + (-0.44).

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