Question

For the process
$X\left(g\right)+e^{-}\to X^{-}\left(g\right),\Delta H=x$
and $X^{-}\left(g\right)\to X\left(g\right)+e^{-},\Delta H=y$
Select correct alternative:

• A. Ionisation energy of $X^{-}\left(g\right)$ is y
• B. Electron affinity of X(g) is x
• C. Electron affinity of X(g) is -y
• D. All the above are correct statements

Answer 1

The correct option is D All the above are correct statements

The Minimum energy required to remove most loosely held the outer most shell in the ground state from an isolated gaseous atom is known as ionization potential.
Electron affinity is the amount of energy released when an electron is added to the outermost shell of one mole of an isolated gaseous atom in its lower energy state.
$X\left(g\right)+e^{-}\to X^{-}\left(g\right);\Delta H=x=EA$ of $X\left(g\right)$
$X^{-}\left(g\right)\to \left(X\right)g+e^{-};\Delta =y=\left(IE\right)$ of $X^{-}\left(g\right)$
$=-\left(EA\right)$ of $X\left(g\right)$