1.

For which of the following processes, enthalpy change is positive

Answer»

`F(g)+e^(-) to F^(-)(g)`
`Cl(g)+e^(-) to Cl^(-)(g)`
`O(g)+2e^(-) to O^(2-)(g)`
`H(g)+e^(-) to H^(-)(g)`

Solution :Gaining of an electron by a gaseous ATOM is usually an exothermic process. GAIN of second electron by NEGATIVELY CHARGED species feels a strong repulsion and the ENERGY of the system increases.


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