(A) : Be and Al have similar properties.
(R) : Cations of Be and Al have same polarising power

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A is false but R is true

A is true but R is false

Both A and R are true and R is the correct explanation

Both A and R are true but R is not the correct explanation of A

answer is B.

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Detailed Solution

We know that Be and $Al$ have similar properties because they show a diagonal relationship that is why they have the same polarising power.

We also know that diagonal relationship is a relationship within the periodic table by which certain elements in the second period have a close chemical similarity to their diagonal neighbours in the next group of the third period.

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