Increasing order of electron gain enthalpy is:

N < O > C l < A l

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O < N < A l < C l

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A l < N < O < C l

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C l < N < O < A l

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Solution

The correct option is C $A l < N < O < C l$
$A l$ is a metal so $A l$ has lowest electron gain enthalpy.
$C l$ has highest electron gain enthalpy.
And electron gain enthalpy increases along a period.
$∴$ The correct order is $A l < N < O < C l$ .

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