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Question

Ionisation energy for hydrogen atom in the ground state is E. What is the ionisation energy of Li++ atom in the 2nd excited state

A
E
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B
3 E
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C
6 E
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D
9 E
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Solution

The correct option is A E
Ionisation energy of atom in nth state EnαZ2n2
For hydrogen atom in ground state (n = 1) and Z = 1 E=E0 ....... (i)
For Li++ atom in 2nd excited state n = 3 and Z = 3, hence E=E032×32=E0 ........ (ii)
From equation (i) and (ii) E=E

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