The potential energy curve for the $\mathrm{H}_{2}$ molecule as a function of internuclear distance is :

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Chemical Bonding and Molecular Structure

The potential energy curve for the

H_{2}

molecule as a function of internuclear distance is :

(A)(see structure)
(B)(see structure)
(C)(see structure)
(D)(see structure)
✓ Correct

Answer: (D)

Solution

As two hydrogen atoms approach from far apart, attraction lowers the potential energy until it reaches a minimum at the equilibrium bond length, where the molecule is most stable; pushing the nuclei still closer sends the energy climbing steeply as electron-electron and nucleus-nucleus repulsion take over. The curve that descends to a single minimum and then rises sharply at short internuclear distance represents the

H X_{2}

molecule.

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Single correct option

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