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The correct option for the first ionisat...

The correct option for the first ionisation enthalpy (in kJ `"mol"^(-1)` ) of Li, Na, K and Cs respectively is

A

496, 520, 419, 374

B

374, 419, 496, 520

C

520,496, 419, 374

D

374,419, 520, 496 124.

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The correct Answer is:
C
First ionisation enthalpy increase with smaller size. Li is smallest. So, Li has highest first lonisation enthalpy. Li > Na > K > Cs.
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