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Tuesday, June 3, 2025

The figure below is the plot of potential energy versus internuclear distance (๐‘‘) of H2 molecule in the electronic ground state. What is the value of the net potential energy ๐ธ0 (as indicated in the figure) in kJ mol^−1 , for ๐‘‘ = ๐‘‘0 at which the electron-electron repulsion and the nucleus-nucleus repulsion energies are absent? As reference, the potential energy of H atom is taken as zero when its electron and the nucleus are infinitely far apart. Use Avogadro constant as 6.023 × 10^23 mol^−1 .

SOLUTION:

Which one of the following statements is not true regarding diborane?

(A) It has two bridging hydrogens and four perpendicular to the rest.

(B) When methylated, the product is Me4B2H2.

(C) The bridging hydrogens are in a plane and perpendicular to the rest.

(D ) All the B–H bond distances are equal



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