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Question

The ionisation enthalpies of atoms A and B are 400 and 300 kcal mol−l respectively. The electron gain enthalpies of these atoms are 80.0 and 85.0 kcal mol−l respectively. Which of the atoms has a higher electronegativity?

A
A
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B
B
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C
Both have same electronegativity
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D
Can't be predicted
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Solution

The correct option is A A
Electronegativity=Ionisation energy + Electron affinity2
Since units are in kcalmol1, we need to convert it. The formula is applicable when I.E and E.A are given in eV/atom. So,
XA = 400+802×62.5 = 3.84

XB = 300+852×62.5 = 3.08
Hence, electronegativity of A is greater than that of B.

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