Question

Which of the following properties of halogens increases with the increasing atomic number?

(I) Ionization energy,

(II) Ionic radius,

(III) The bond energy of the $X_2$ molecule,

(IV) Enthalpy of vaporisation.

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

Answer 1

Answer: (C)

II,IV

1. Ionisation energy decreases down the group.

2. Ionic radius increases down the group.

3. Bond energy decreases down the group.

4. Enthalpy of vaporisation increases down the group.

Thus, statement II and IV are correct.

Hence, the correct option is $\text{C}$