Fundamentholfundamenthol
NEET2019Paper 2019Chemistry
Q.

For the second period elements the correct increasing order of first ionisation enthalpy is:

  1. A

    Li < Be < B < C < N < O < F < Ne

  2. B

    Li < B < Be < C < O < N < F < Ne

  3. C

    Li < B < Be < C < N < O < F < Ne

  4. D

    Li < Be < B < C < O < N < F < Ne

Solution

‘Be’ and ‘N’ have comparatively more stable

valence sub-shell than ‘B’ and ‘O’.

Correct order of first ionisation enthalpy is:

Li < B < Be < C < O < N < F < Ne

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