1.

If the ionisation enthalpy and electron gain enthalpy of an element are 275 and 86 kcal mol^(-1) respectively, then the electronegativity of the element on the pauling scale is:

Answer»

2.8
0
4
2.6

Solution :I.E.+E.A.`=275+86=361` kcal `mol^(-1)`
`=361xx4.184=1510.42kJ" "mol^(-1)`
`therefore`ELECTRONEGATIVITY`=(1510.42)/(540)=2.797=2.8`


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