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The potential energy (y) curve for H2 formation as a function of internuclear distance (x) of the H atoms is shown below.

The bond energy of H2 is

(1) (c – a) 

(2) (b – a)

(3) $(c – a)\over2$

(4) $(b – a)\over2$

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Chemical bonding and molecular structure

2 Answers

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Best answer

Ans: (2) (b – a)

Sol. 

  • Potential energy of two H atoms at infinite distance = a
  • Potential energy of two H atoms at distance equal to bond length = b

BE = (b – a)

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Correct ans is (b-a)
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