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Q.

Ionisation potential values of Li, Be and B are respectively in kJ mol–1

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a

520, 899, 801

b

899, 801, 520

c

520, 801, 899

d

801, 899, 520

answer is D.

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Detailed Solution

detailed_solution_thumbnail

I.E values increases from left to right in a period.

But, the order of I.E values is, Li < Be > B. 

This is due to completely filled configuration of 'Be'(1s22s2)

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