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Question

What is the correct order of successive ionization enthalpies?

A
IEIII>IEII>IEI
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B
IEI>IEII>IEIII
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C
IEII>IEI>IEIII
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D
IEIII>IEI>IEII
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Solution

The correct option is B IEIII>IEII>IEI
The ionization energy of a multivalent atom increases with a consecutive removal of an electron. This is due to an increase in effective nuclear charge on the valence electron that makes it difficult to ionize a cation.
Therefore IE1<IE2<IE3 and so on
option A

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