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Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> When the first electron gain enthalpy (ΔegH) of oxygen is 141 kJ/mol, its second electron gain enthalpy is:

JEE MAIN - 2019

A
Almost the same as that of the first
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B
Negative, but less negative than the first
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C
A positive value
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D
A more negative value than the first
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Solution

The correct option is C A positive value
Second electron gain enthalpy is always positive for any element, as energy has to be supplied to overcome the repulsion betwen the anion and the incoming electron.

O(g)+eO2(g) ; ΔegH=positive
C is the correct option


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