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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.
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Detailed Solution
Ionisation enthalpy generally increases from left to right along a transition series, since there is a corresponding increase in nuclear charge accompanying the filling of electrons into the inner d-orbitals, which are not very effective at shielding the outer electrons. The Reason correctly explains the Assertion.