Statement-1: 1st and 2nd ionisation enthalpies in the first series of transition elements vary irregularly.
Statement-2: Variation depends on the stability of d-configuration.

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Statement--1 is True, Statement-2 is False.

Statement-1 is False, Statement-2 is True.

Stat.ement-1 is True, Statement-2 is True; Statemen~2 is a correct explanation for Statement-1.

Statement-1 is True, Stat.ement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.

answer is A.

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Detailed Solution

The first and second ionisation enthalpy values increase steadily from left to right with some abnormalities in the first transition series.
The nucleus and outer electron become more attracted to one another as the nuclear charge rises, which raises the ionisation enthalpy. The stability of the d-configuration affects this variation.

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