The equation used to represent the electron gain enthalpy is

Options

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

Answer

A

Explanation

Electron gain enthalpy is the enthalpy change, when a negative ion is formed from a neutral gaseous atom by addition of `e^(-)`.
  i.e, `X(g) +e^(-1)toX_(g)^(-1)`