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Statement-1: Boron has a smaller first i...

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.

A

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

B

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

C

Statement-1 is True, Statement-2 is False

D

Statement-1 is False, Statement-2 is True

Text Solution

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The correct Answer is:
C
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Assertion: Boron has a smaller first ionisation enthalpy than beryllium. Reason: The penetration of a 2s electron to the nucleus is more than the 2p electron, hence 2p electorn is more shielded by the inner core of electrons than the 2s electrons.

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Why 2s^2 electron is difficult to remove than 2p electron ?

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GRB PUBLICATION-PERIODIC TABLE-Reasoning Type
  1. Statement-1: First ionisation energy of O^(+)(g) is greater than that ...

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  2. Statement-1: Down the group, electronegativity decreases from B to TI....

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  3. Statement-1: Sc(Z = 21) is placed as d-block element. Statement-2: L...

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  4. Statement-1: Na^(+) and AI^(3+) are isoelectronic but the magnitude of...

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  5. Statement-1: The atomic radii of the elements of the oxygen family are...

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  6. Statement-1: Metallic character of first group metals increases down t...

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  7. Statement-1: Fluorine has a less negative electron gain enthalpy than ...

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  8. Statement-1: Fluorine forms only one oxoacid, HOF, Statement-2: Fluo...

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  9. Statement-1: Li and Mg shows diagonal relationship. Statement-2: Li...

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  10. Statement-1: The decreasing order of acidi character of CO(2),N(2)O(5)...

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  11. Statement-1: Oxidising property of F(2) is greater than Cl(2). State...

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  12. Statement-1: Generally, ionisation enthalpy increases from left to rig...

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  13. Statement-1: Boron has a smaller first ionisation enthalpy than beryll...

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  14. Assertion: Electron gain enthalpy always becomes less negative as we g...

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  15. Assertion: The first ionisation energy of Be is greater than that of B...

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  16. Statement-1: The acidic strength order of hydra acids is HF lt HCI lt ...

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  17. Statement-1: The decreasing order of acidic character of CO(2),N(2)O(5...

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  18. Statement-1: The ionisation potential of Sn is greater than Pb. Stat...

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  19. Statement-1: (I.E.)(n) of an atom is always greater than (I.E)(n-1) (n...

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  20. Statement-1: Nitrogen atom has higher ionization energy than fluorine ...

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