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Question

Which of the following species has lowest ionisation enthalpy?

A
O
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B
O+
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C
O−
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D
O2−
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Solution

The correct option is D O2−
O2− has the lowest ionisation energy, because it has more number of electrons in valence shell which create repulsive force among them.
Therefore it is easier to loose an electron. So, O2− has lowest ionisation enthalpy.

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