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Question

Which of the following pairs has almost same colour?

A
60Nd3+, 69Tm3+
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B
70Yb3+, 59Pr3+
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C
63Eu3+, 67Tb3+
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D
64Gd3+, 67Ho3+
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Solution

The correct option is C 63Eu3+, 67Tb3+
Eu3+ and Tb3+ have the same colour

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