NEET-XII-Chemistry
Previous Year Paper year:2017
- #60For the second period elements the correct
increasing order of first ionisation enthalpy is:
(1) Li < Be < B < C < N < O < F < Ne
(2) Li < B < Be < C < O < N < F < Ne
(3) Li < B < Be < C < N < O < F < Ne
(4) Li < Be < B < C < O < N < F < NedigAnsr: 2Ans : ( 2 )
Sol. ‘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