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Question

which metal cation is the best oxidizing agent?


A

Pb2+

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B

Cr3+

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C

Fe2+

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D

Sn2+

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Solution

The correct option is A

Pb2+


The explanation for the correct answer

(A)Pb2+

  1. Pb2+ is the best oxidizing agent as it has a very high reduction potential.
  2. Reduction potential is defined as the ability of an electrode to gain electrons or to get reduced.
  3. The reduction potential of Pb2+ is -0.13V. Pb2+aq+2e-Pbs
  4. Thus is the best oxidizing agent.

The explanation for the incorrect answers

(B)Cr3+

  1. Cr3+has the reduction potential -0.74V which is very less. Cr3+aq+2e-Crs
  2. So, is not a good oxidizing agent.

(C)Fe2+

  1. Fe2+ has the reduction potential -0.44V. Fe2+aq+2e-Fes
  2. So, not a good oxidizing agent.

(D)Sn2+

  1. The reduction potential of Sn2+ is -0.16V.
  2. As the reduction potential of Sn2+is quite high so it is a good oxidizing agent. Sn2+aq+2e-Sns
  3. It is a good oxidizing agent but has a low value of reduction potential than that of Pb2+.

Therefore, option A is correct. Pb2+is the best oxidizing agent.


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