Statement-1: Boron has a smaller first ionisation enthalpy than beryllium.
Statement-2: The penetration of a 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded (according to Slater) by the inner core of electrons than the 2s electrons.

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

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.

answer is C.

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Detailed Solution

When beryllium is ionised, the electron is taken out of the s orbital and the P orbital of the boron atom, respectively. 2s electrons have a greater penetrating effect on the nucleus than 2p electrons. Because of this, the 2p electrons of boron are more protected from the nucleus than the 2s electrons of beryllium.

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