Q124 / 180 · KCET 2007 · Physics

The ionisation energy of $\mathrm{Li}^{2+}$ is equal to

Correct answer
A
$9 h c R$
B
$6 h c R$
C
$2 h c R$
D
$h c R$

Solution

Ionization energy $=R c h Z^{2}$ $$ Z=3 \text { for } \mathrm{Li}^{2+} $$ $\therefore$ Ionization energy $=(3)^{2} R c h=9 R c h$

Hence, the correct answer is option: 'A'.

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