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The order of ionization potential between He⁺ ion and H atom (both species are in gaseous state) is

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I.P (He⁺) =I.P (H)

Cannot be compared

I.P (He⁺) $>$ I.P (H)

I.P (He⁺) $<$ I.P (H)

answer is C.

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Detailed Solution

He⁺ and H atom have only one electron, these two are isoelectronic species the species with highest nuclear charge have high ionization energy than other.
I.P.(He⁺) > I.P(H)

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