Question

$I$. Under standard conditions the states of the elemental forms of the halogens are: iodine-solid, bromine-liquid, chlorine-gas, fluorine-gas.
$II$. Diatomic halogen molecules exhibit dispersion forces and increase in mass moving down through the family.

• A. Statement $I$ is true, Statement $II$ is true and is a correct explanation of the phenomena described in $I$
• B. Statement $I$ is true, Statement $II$ is false
• C. Statement $I$ is false, Statement $II$ is true
• D. Statement $I$ is false, Statement $II$ is false

Answer 1

The correct option is A Statement $I$ is true, Statement $II$ is true and is a correct explanation of the phenomena described in $I$

Here, Iodine, bromine, chlorine and fluorine belongs to the same group. The order of their atomic mass are:

$I>Br>Cl>F$

These diatomic atoms are having dispersion forces between them. So, their state completely depend upon their atomic mass.

So, correct answer is option $A$.