Second ionisation energy is higher than first ionisation enengy for an element. This is because

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Nuclear charge is high in cation

Bond energy changes with charge

Effective nuclear charge is more for cation

Size of cation is higher than neutural atom

answer is C.

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Detailed Solution

In first ionisation energy, we remove electron from a neutral atom but for second ionisation we have to remove electron from a positive atom, where electron are more tightly bounded due to increased attraction force so second ionisation energy is high relative to first IP.

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