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Q.

The first, second and third ionisation energies E1,E2 and E3 for an element  are 7 eV, 12.5 eV and 82.5 eV respectively. The most stable oxidation state of the element will be:

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a

+1

b

+4

c

+3

d

+2

answer is D.

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Detailed Solution

There is large gap (> 70 eV) between second and third ionisation energies. It can lose two electrons easily ;So the most stable oxidation state of the element will be +2.
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