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Q.

If ionization enthalpy for hydrogen atom is 13.6 eV, then ionization enthalpy for He+ will be

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a

24.5eV

b

54.4eV

c

6.8eV

d

13.6eV

answer is A.

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Detailed Solution

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Energy of electron in nth orbit of a hydrogen-like species =−13.6×(Z)2​ eV

 Ionization potential =13.6xZ2 For H,

Z =1 He+,Z =2. ∴ Ionization potential of He+ =13.6×22=54.4 eV

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