Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is C.

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Detailed Solution

Eu²⁺and Yb²⁺ ions in solution are good reducing agents because they have a tendency to acquire +3 oxidation state (common oxidation state of lanthanides). So, for that, they undergo oxidation and reduce other substances.

Eu²⁺ is formed by losing two s-electrons with f⁷electronic configuration.

Yb⁺²=[Xe]4f¹⁴5d⁰6s⁰.

Hence, (A) is true but (R) is false.

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