Question

Dicky, Micky and Vicky had three liquids, $A,B$ and $C$ respectively. They mixed these liquids and observed that they form a homogeneous mixture. They were unable to separate the liquids and asked their teacher to separate these for them. The teacher subjected the given mixture to fractional distillation. Liquid $B$ was obtained in the receiver flask. On further distillation, $A$ was left behind in the distillation flask. On the basis of the result, arrange the critical temperatures of $A,B$ and $C$ in their respective gaseous states in proper order.

• A. $A>B>C$
• B. $A>C>B$
• C. $B>C>A$
• D. $C>B>A$

Answer 1

The correct option is B $A>C>B$

Fractional distillation is the separation of a mixture into its component parts, or fractions, by their boiling points.

Since $B$ is collected first, it has the lowest critical temperature followed by $C$ and as $A$ is left behind in the distillation flask, it has the highest critical temperature.

Therefore, option $\left(B\right)$ is correct.