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Q.

Assertion (A) The atomic and ionic radii are generally decrease towards right in a period.Reason (R) The ionisation enthalpy increases on moving towards left in a period

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a

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

b

Both A and R are correct; and R is not the correct explanation of A.

c

A is correct; R is incorrect.,

d

R is correct; A is incorrect.

answer is C.

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Detailed Solution

The ionisation enthalpy increases on moving towards the extreme right element in period and atomic and ionic radii decrease in a period from left to right.
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Assertion (A) The atomic and ionic radii are generally decrease towards right in a period.Reason (R) The ionisation enthalpy increases on moving towards left in a period