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Question

In Born-Haber cycle, the sum of the enthalpy changes around a cycle is


  1. Constant

  2. Zero

  3. Positive integer

  4. Negative integer


Solution

The correct option is B

Zero


The Born-Haber cycle, is based on Hess Law or Law of constant heat summation which states that the standard enthalpy of reaction is the sum of algebraic sum of the standard enthalpies of reactions into which the overall reaction may be splitted. So the change in enthalpy around a cycle is zero.

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