Question

The equation used to represents the electron gain enthalpy is

• A. $X(g)+e^{-}⟶X^{-}(g)$
• B. $X(s)+e^{-}⟶X^{-}(g)$
• C. $X(g)⟶X^{+}(g)+e^{-}$
• D. $X(s)⟶x^{+}(g)+e^{-}$

Answer 1

Answer: (A)

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 $\left(\Delta e_{g}H\right)$. It is a direct measure of the ease with which an atom attracts an electron to form anion.
$X(g)+e^{-}⟶X^{-}(g);\Delta e_{g}H$