Reason for diagonal relationship is

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Similar size

Same electronegativity

Same electron affinity

Same polarisability

answer is A.

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Detailed Solution

The diagonal relationship is due to the polarizing power, that is, ionic charge/ionic radius, being similar for the diagonally placed elements. A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods (first 20 elements) of the periodic table

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