JEE Main Atoms and Molecules — practice questions

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Atoms and Molecules questions and exercises with answers

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According to the Bohr model, the ground-state energy of a hydrogen atom is:Read the answer and worked solution →

Worked practice questions

According to the Bohr model, the ground-state energy of a hydrogen atom is:

$-13.6$ eV
$-6.8$ eV
$-27.2$ eV
$-3.4$ eV

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Correct answer: A. $-13.6$ eV

Bohr's energy formula: $E_n = -\dfrac{13.6}{n^2}$ eV for hydrogen. For the ground state $n = 1$: $E_1 = -13.6$ eV. - Option A ($-3.4$ eV) is $E_2$. - Option D ($-27.2$ eV) is the magnitude of *twice* the ground-state energy (a common confusion with the virial-theorem relation $E = -\frac{1}{2}|U|$).

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