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Question

Following are the values of the electron affinities of (in kJ mol1) the formation of O and O2 from O:

A
142,702
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B
142,702
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C
142,702
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D
142,142
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Solution

The correct option is B 142,702
O(g)+eO(h) EA=ve
O(g)+eO2(g) EA=+ve
This is because, existing electron have higher repulsive forces and because of that when O ion gets electron, it absorb some energy for this process.

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