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Q.

Born Haber cycle helps to determine lattice enthalpy of ionic compound as well as electron gain enthalpy of different elements. Based on the diagram drawn, answer the questions given below.
What is the electron gain enthalpy of $Cl (g)$ ?

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a

-10 kJ

b

-25kJ

c

-20kJ

d

- 5kJ

answer is D.

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Detailed Solution

The change in enthalpy associated with the formation of one mole of an ionic compound from its gaseous state and standard conditions.

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$Δ H_{eg} of Cl = \frac{- 20}{2} = - 10 kJ$

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