JEE Main 2026 · 2 Apr · Shift 1 · Chemistry Q52

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ChemistrySingle correct+4 / -1Question 52 of 75

What is the energy (in J atom $^{-1}$ ) required for the following process ?
$\ce{Li^{2+}(g) -> Li^{3+}(g) + e-}$
(Take the ionization energy for the H atom in the ground state as $2.18\times10^{-18}$ J atom $^{-1}$ )

8.72\times10^{-18}

1.962\times10^{-18}

1.962\times10^{-17}

6.54\times10^{-17}

Answer and worked solution

Official answer: C

Hydrogen-like ion. $\ce{Li^{2+}}$ has one electron and $Z=3$ , so its ionisation energy is $Z^2$ times hydrogen's:
$9\times2.18\times10^{-18}=1.962\times10^{-17}\text{ J atom}^{-1}.$

(C)

Topics:Bohr model

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JEE Main 2026 · 2 Apr · Shift 1, Chemistry question 52