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Standard IX
Chemistry
Classification of Modern Periodic Table
Which of the ...
Question

Which of the following pairs are chemically dissimilar?

A
Na, K
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B
Ba, Sr
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C
Zr, Hf
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D
Ca, Cu
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Solution

The correct option is D Ca, Cu
The electronic configuration of the elements reflects their chemical properties. The electronic configuration of calcium is 2,8,8,2 and that of copper is 2,8,18,1. Since the electronic configurations of Ca and Cu are different, they are chemically dissimilar.

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