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Question

(IE)1 and (IE)2 in kJ mol−1 of K and Ca have been given as

(IE)1
(IE)2
K
419
3052
Ca
590
1145
The difference can be explained by:

A
stable inert gas configuration
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B
hydrogen bonding
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C
steric hindrance
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D
vanderwall effect
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Solution

The correct option is A stable inert gas configuration
(IE)2 of K >>> (IE)1 of K since K+ (after one electron is removed)
has stable inert gas configuration as compared to corresponding values for Ca in which Ca+ can lose second electron easily.

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