IE(1)andIE(2) of Mg are 179 and 348 "kc...

`IE_(1)andIE_(2)` of Mg are 179 and 348 `"kcal mol"^(-1)` respectively . The energy required for the reaction `"Mg"to"Mg"^(2+)+2e^(-)` is

`+169" kcal mol"^(-1)`

`-169" kcal mol"^(-1)`

`+527" kcal mol"^(-1)`

`-527" kcal mol"^(-1)`

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The correct Answer is:

Ionisation enthalpy is the energy required to release an electron from the outermost shell.

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