Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion: Ionisation enthalpy increases along each series of the transition elements from left to right. However, small variations occur.
Reason: There is corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals.

In the light of the above statements, choose the most appropriate answer from the options given below :

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

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

Both (A) and (R) are correct and (R) is the correct explanation of (A)

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

answer is C.

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Detailed Solution

In the beginning of the series, ionization energy increases from left to right and atomic number due to increase in effective
nuclear change. But due to addition of electrons, shielding effect also increases, that tends to decrease the attraction due to
nuclear change.
As a result, certain variation in observed in transition elements. For example, high ionization enthalpy of d^o, d⁵, d¹⁰ due to extra stability.

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