If ionisation potential for hydrogen atom is 13.6 eV, then ionisation potential for $L i^{+ 2}$ will be:

119.4 eV

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120.4 eV

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122.4 eV

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54.4 eV

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Solution

The correct option is C 122.4 eV
$E_{L i^{+ 2}} = E_{H} \times Z^{2}$
$= 13.6 \times 9$
= 122.4 eV

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