Chemistry PYQ 35 of 152 · Reactions & Catalysis

Standard electrode potential of three metals A, B and C are respectively 0.5 V, -3 V and -1.2 V. Reducing power of these metals would be

  1. AA > C > B
  2. BB > C > A
  3. CC > B > A
  4. DNone of the above

70th BPSC

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Correct answer: (b) B > C > A

Explanation

Reducing power is inversely related to standard electrode potential (E°) – the more negative E°, the stronger the reducing power.

Given E°: A = +0.5 V, B = −3 V, C = −1.2 V, so B is strongest and A is weakest.

Order of reducing power: B > C > A.

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