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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 by the inner core of electrons than the 2s electrons.

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Statement 1 is true and Statement 2 is false.

Both Statement 1 and Statement 2 are false.

Both Statement 1 and Statement 2 are true.

Statement 1 is false and Statement 2 is true.

answer is A.

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Detailed Solution

The order of penetrating power of various orbitals is, S>P>d>f ;

$Penetrating power \propto \frac{1}{screening effect}$

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