For the second period elements the correct increasing order of first ionisation enthalpy is
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a
Li
b
Li
c
Li
d
Li
answer is B.
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Detailed Solution
As we go from left to right in a period ionisation energy increases. ′Be′ and ′N′ comparatively more stable valence subshell than 'B' and 'O'.Hence, the correct order of first ionisation enthalpy is: s1