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Q.

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
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