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Q.

Assertion (A) : Elements belonging to same group have similar properties.
Reason (R) : Same groups after the difference of either 2 or 8 or 18 or 32 in the atomic number and having similar valence shell electronic configuration have similar properties.

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a

Both A and R are correct and R is correct explanation of A.

b

Both A and R are correct but R is not correct explanation of A.

c

A is correct and R is incorrect.

d

A is incorrect and R is correct.

answer is A.

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Detailed Solution

Assertion: It is fact that elements belonging to same group have similar properties.

Reason: R is the correct explanation of A because this is the cause of periodicity in atomic properties.

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Assertion (A) : Elements belonging to same group have similar properties. Reason (R) : Same groups after the difference of either 2 or 8 or 18 or 32 in the atomic number and having similar valence shell electronic configuration have similar properties.