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NTA Abhyas JEE Main2020ChemistryRedox ReactionsPractice

All the following species are strong oxidizing agents. Their strength as oxidizing agents in acidic solution is such that

Options

  1. AS 2 O 8 2 - > C r 2 O 7 2 - > M n O 4 -
  2. BM n O 4 - > C r 2 O 7 2 - > S 2 O 8 2 -
  3. CS 2 O 8 2 - > M n O 4 - > C r 2 O 7 2 -
  4. DM n O 4 - > S 2 O 8 2 - > C r 2 O 7 2 -

Correct answer

C. S 2 O 8 2 - > M n O 4 - > C r 2 O 7 2 -

Step-by-step solution

The standard reduction potentials of the above species in acidic medium are as given below S 2 O 8 2 - ( a q ) + 2 e - → 2 S O 4 2 - ( a q ) ; E ° = + 2.01 V M n O 4 - ( a q ) + 8 H + + 5 e - → M n 2 + ( a q ) + 4 H 2 O ; E ° = + 1.77 V C r 2 O 7 2 - ( a q ) + 14 H + + 6 e - → 2 C r 3 + + 7 H 2 O ; E ° = + 1.33 V The more the standard reduction potential, the more the tendency of the species to undergo reduction and more strongly it (species) would work as oxidizing agent. As a result, their strength as oxidizing a

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