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Question

Arrange the following in increasing order of the property indicated: 
F, Cl, Br and I (electron gain enthalpy) 


Solution

 Increasing order of electron gain enthalpy is -

$$ I < Br < F < Cl $$

$$Cl + e^- \rightarrow Cl^- + \Delta H$$
Electron gain enthalpy is the energy evolved when an electron is added in the outermost shell.

Energy evolved in addition of electron is highest for Chlorine because it has highest tendency to accept electron in its outermost shell. 

Chemistry

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