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Solution


Q.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Ionisation enthalpy increases along each series of the transition elements from left to right. However, small variations occur.

Reason (R): 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:                  [2023]
1 (A) is correct but (R) is not correct.  
2 (A) is not correct but (R) is correct.  
3 Both (A) and (R) are correct and (R) is the correct explanation of (A).  
4 Both (A) and (R) are correct but (R) is not the correct explanation of (A).  

Ans.

(3)

The increase in nuclear charge and the filling of inner d-orbitals directly contribute to the increased attraction of electrons to the nucleus, making them more difficult to remove and thus increasing ionization enthalpy.