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Q.

The electron affinity of chlorine is 3.8eV. The amount of Energy in Kcal (round off value) released when 2gram of chlorine is completely converted to $C l^{-}$ ion in a gaseous state

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answer is 5.

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Detailed Solution

$\underset{35.5}{Cl} + e \to {Cl}^{-} + \underset{3.8 \times 23.06 Kcal}{3.8 K}$ .

Energy released when 2gram Cl is converted into ${Cl}^{-}$ ions $= \frac{3.8 \times 23.06}{35.5} \times 2 ≅ 5 kcal$

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