Question

Which of the following are correct statements?
I) $X_A-X_B=0.208\sqrt{\Delta }$, $\Delta$ in $KJ/mole$.
II) $X_A-X_B=0.1017\sqrt{\Delta }$, $\Delta$ in $Kcal/mole$.
III) $EN=\frac{(IP+EA)}{544}$, in $KJ/mole$.
IV) $EN=\frac{(IP+EA)}{5.6}eV$.

• A. I and II
• B. I, II and III
• C. III and IV
• D. II and IV

Answer 1

Answer: (C)

III and IV

$EN=\frac{(IP+EA)}{544}$, $inKJ/mole$.

$EN=\frac{(IP+EA)}{5.6}eV$.

The given formulas are used to calculate electronegativity in the Mulliken scale. The formula can be expressed in KJ/mole as well as in eV.

Here, $IP$ stands for ionization potential and $EA$ is electron affinity.

For calculating electronegativity in Puling scale, we use,

$X_A-X_B=0.102\sqrt{\Delta }{eV}^{-1/2}$

Where, $X_A$ and $X_B$ are the electronegativity of an elements A and B and $\Delta$ is the change in Bond energy.

Thus Statement $III$ and $IV$ are correct.