Q.

(A) BeCl2 is covalent whereas  BaCl2 is ionic.
(R) Smaller is size of the cation, greater is the polarising power.

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a

If both (A) and (R) are correct but (R) is not the correct explanation of (A)

b

If both (A) and (R) are correct and (R) is the correct explanation of (A)

c

If (A) is correct but (R) is not correct

d

If (A) is incorrect but (R) is correct

answer is A.

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(A) BeCl2 is covalent whereas  BaCl2 is ionic.(R) Smaller is size of the cation, greater is the polarising power.