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Question

Out of FeO2−4, FeCl3, FeCl2 and Fe :

A
best reducing agent is Fe
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B
best oxidising agent is FeO24
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C
best oxidising agent is FeCl3
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D
best reducing agent is FeO24
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Solution

The correct options are
A best reducing agent is Fe
B best oxidising agent is FeO24
Species which has least oxidation number is oxidised and thus is the best reducing agent while species which has maximum oxidation number is reduced and thus is the best oxidising agent.

The oxidation number of Fe in Fe, FeCl2, FeCl3 and FeO24 is 0,+2,+3 and +6 respectively.

The oxidation number of iron in iron metal is lowest. It is easily oxidized. Hence, it is best reducing agent. Thus, option (A) is correct.

The oxidation number of FeO24 is highest. It is easily reduced. Hence, it is best reducing agent. Thus, option (B) is also correct.

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