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Question

If the ionization enthalpy and electron gain enthalpy of an element are 275 and86 kcal mol1 respectively, then the electro -negativity of the element on the Pauling scale is:

A
2.8
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B
0
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C
4
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D
2.6
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Solution

The correct option is D 2.8
|XAXB|=0102×ΔE12=0102×{(27586)×418}kJ/mol=0102×281069=28628

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