Whichone (atom//ion )in the followingpairshas highestelectrongainentha

1.	Whichone (atom//ion )in the followingpairshas highestelectrongainenthalpy ? (i)O^(-)S(ii) O, S^(-)(iii) O^(-), S^(-)(iv)N^(-)P
Answer» <P> Solution :(i) Dueto repulsionsbetweenthe ELECTRONSON `O^(-)` and theadditional incomingelectron , theelectron gainenthalpy of `O^(-)` is positivewhilethat O a -ve (ii) Onsimilargroundsthe electron gainenthalpyof `S^(-)` is+ vewhilethat OFO is - ve (iii) dueto smallsizerepulsionsbetween `O^(-)` and theincomingelectron is muchmore thanin `S^(-)` .thereforeelectron gainenthalpyof `O^(-)` is more+ vethanthatof `S^(-)` (iv) DUE torepulsion between`N^(-)` and theincomingelectron gainenthalpyof `N^(-)` positivewhilethat P is -ve

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