The equation used to represent the electron gain enthalpy is

Options

A. `X(g)+e^(-)rarrX^(-)(g)`
B. `X(s)+e^(-)rarrX^(-)(g)`
C. `X(g)rarrX^(+)(g)+e^(-)`
D. `X(s)rarrX^(+)(g)+e^(-)`

Explanation

When an electron is added to a gaseous atom in its ground state to convert it into a negative ion, the enthalpy change accompanying the process is called electron gain enthalpy `(Deltae-(g)H)`.
It is a direct measure of the ease with which an atom attracts an electorn to form anion.
`X(g)+e6(-)rarrX^(-)(g),Deltae_(g)H`