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The electrode potential, E ° , for the reduction of M n O 4 - to M n 2 + in acidic medium is +1.51 V. Which of the following metal(s) will be oxidised? The reduction reactions and standard electrode potentials for Z n 2 + , A g + and A u + are given as Z n a q 2 + + 2 e - → Z n s , E ° = - 0.762 V A g a q + + e - ⇌ A g x , E ° = + 0.80 V A u a q + + e - ⇌ A u s , E ° = + 1.69 V

Options

  1. AZn and Au
  2. BAg and Au
  3. CAu
  4. DZn and Ag

Correct answer

D. Zn and Ag

Step-by-step solution

More +ve the value of reduction potential more will be the tendency to undergo reduction. The E red o MnO 4 − | Mn 2 + = + 1.51   V value is greater than E red o Zn 2 + | Zn = − 0.762   V and E red o Ag + | Ag = + 0.80   V . Thus, only Zn and Ag will be oxidised.

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