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Question

Here is a list of metals and their potentials. Pick the ones which are stronger oxidizing agents than hydrogen electrode. You can pick more than one.

A
Metal A - Reduction potential 3.4
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B
Metal B - Oxidation potential 2.3
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C
Metal C - Reduction potential -1.4
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D
Metal D - Oxidation potential -0.9
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Solution

The correct option is D Metal D - Oxidation potential -0.9
Metal A has a higher reduction potential (3.4) than standard hydrogen electrode reduction potential (0), thus metal A is a stronger oxidizing agent.
Oxidation potential = (-) reduction potential
Reduction potential of metal D is = 0.9 which also higher than hydrogen electrode, hence it is a stronger oxdizing agent.

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