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Question
Electron gain enthalpy of 17th group elements are −349,−328,−325,−296,−270 kJ/mol (not in order). The element which has electron gain enthalpy −296kJ/mol is:
Electron gain enthalpy of 17th group elements are −349,−328,−325,−296,−270 kJ/mol (not in order). The element which has electron gain enthalpy −296kJ/mol is:
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Solution
The correct option is D I
On moving down the group atomic size and nuclear charge increases. The effect of increase in atomic size is more pronounced than that of nuclear charge.X+e−⟶X−Electron gain enthalpy becomes less negative on going down the group.F=−328 KJ/molCl=−349 KJ/molBr=−325 KJ/molI=−296 KJ/mol
On moving down the group atomic size and nuclear charge increases. The effect of increase in atomic size is more pronounced than that of nuclear charge.
X+e−⟶X−
Electron gain enthalpy becomes less negative on going down the group.
F=−328 KJ/mol
Cl=−349 KJ/mol
Br=−325 KJ/mol
I=−296 KJ/mol
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