Q.

Which of the following has the highest first ionisation energy

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a

Li

b

Be

c

B

d

C

answer is D.

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Detailed Solution

The ionisation energy of Li,Be,B and C is 520, 899. 801, 1086 kJ /mol respectively hence, carbon has highest IE1.(∵ IE increases across a period, exceptionally high IE of Be is due to its completely filled configuration)
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