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Question

Which of pair of ions will act as strong oxidising agents?

A
Mn3+ and Co3+
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B
Mn3+ and Sc3+
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C
Co3+ and Sc3+
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D
Cr3+ and Ti3+
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Solution

The correct option is A Mn3+ and Co3+
Oxidising agents will oxidise other compounds and itself get reduced. Thus, higher value of E0M3+/M2+ indicates its high ability to get reduced from M3+ to M2+.
Hence, ions which has high positive E0M3+/M2+ value will act as strong oxidising agent.

In 3d-series, Managane has high E0M3+/M2+ value because Mn2+ is stable due to half filled d-orbital.
Also, Cobalt has high E0M3+/M2+ value to higher third ionisation value.

Hence, Mn3+ and Co3+ will act as strong oxidising agents.

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