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Q.

Second ionization potential of Li, Be and B is in the order :

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a

Li > Be > B

b

Li > B > Be

c

Be > Li > B

d

B > Be > Li

answer is B.

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Detailed Solution

Li1s22s2⟶IB1Li+1s2⟶IP2Be⁡1s22s2⟶IP1Be+1s22s1⟶IP2B1s22s22p1⟶IP1B+1s22s2⟶IP2Decreasing order of ionisation potential : Li > B > Be.
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