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Question

During the formation of a chemical bond:

A
electron-electron repulsion becomes more than the nucleus-electron attraction
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B
energy of the system does not change
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C
energy increases
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D
energy decreases
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Solution

The correct option is D energy decreases
When a bond forms, electrons are attracted to the space between nuclei where the electrostatic force of attraction is greater. As the electrons fall to a position of lower potential energy, the total mechanical energy of the molecular system decreases.

Hence, option D is correct.

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