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Q.

Which of the following pair contains all diamagnetic ions

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a

Lu+3 and Gd+3

b

Ce+4 and Pr+4

c

Dy+3 and Lu+3

d

Yb+2 and Lu+3

answer is A.

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Detailed Solution

Yb in +2 oxidation states acquires half filled-4f7 and fully filled-4f 14 configuration.Tb in +4 state has 4f7 half-filled stable configuration but it readily gets reduced to common oxidation +3 state.

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