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Q.

Strong reducing and oxidizing agents among the following respectively, are

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a

${Ce}^{4 +} and {Tb}^{4 +}$

b

${Ce}^{3 +} and {Ce}^{4 +}$

c

${Ce}^{4 +} and {Eu}^{2 +}$

d

${Eu}^{2 +} and {Ce}^{4 +}$

answer is A.

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Detailed Solution

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Eu exhibits both +2 and +3 oxidation states similarly, Ce exhibits +3 and +4 oxidation states.

Based on E^o value, Ce⁺⁴ acts as strong oxidant.

However, Eu⁺² is a strong reductant as it changing to the common +3 state.

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