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Question

The correct order of size is

A
Pr3+>Dy3+>Eu3+>Tm3+
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B
Eu3+>Pr3+>Dy3+>Tm3+
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C
Pr3+>Tm3+>Eu3+>Dy3+
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D
Pr3+>Eu3+>Dy3+>Tm3+
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Solution

The correct option is D Pr3+>Eu3+>Dy3+>Tm3+
Size of Ln3+ decreases with increasing atomic number.

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