Q.

Which pair is different from the others?

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a

Na-K

b

Ca-Mg

c

Li-Mg

d

B-Al

answer is C.

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Detailed Solution

1. Both elements belong to group 1.2. Both elements belong to group 2.3. Li of group 1 element and Mg is of group 2 element, hence different pairs form other pairs.4. Both elements belong to group 13 elements.
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