Q32 / 160 · TS EAMCET 2015 · Chemistry

The equation used to represents the electron gain enthalpy is

  • Correct answer
    A
    $X(g)+e^{-} \longrightarrow X^{-}(g)$
  • B
    $X(s)+e^{-} \longrightarrow X^{-}(g)$
  • C
    $X(g) \longrightarrow X^{+}(g)+e^{-}$
  • D
    $X(s) \longrightarrow X^{+}(g)+e^{-}$

Solution

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. $$ X(g)+e^{-} \longrightarrow X^{-}(g) ; \Delta e_g H $$

Hence, the correct answer is option: 'A'.

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