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Statement-1: Generally, ionisation enthalpy increases from left to right in a period.
Statement-2: When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of inner core of electrons does not increase very much to compensate for the increased attraction of the electron to the nucleus.

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

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

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

Statement-1 is True, Statement-2 is True; Statement is a correct explanation for Statement-1.

answer is A.

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Detailed Solution

As atomic size shrinks over the period, ionisation enthalpy rises from left to right.

The attraction of the nucleus increase across a period which is the reason of increasing ionisation enthalpy from left to right in a period.

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