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. One further distillation A was left behind in the distillation flask. On the basis of the result, comment on the critical temperatures of A, B and C in their respective gaseous states.

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Solution

(i) From the given data, it can be said that the boiling point of B is less than that of C which is less than of A.
(ii) For liquid with the high boiling point, the intermolecular forces of attraction are also very high, that's why they have a high critical temperature.
Therefore, the critical temperature of A is greater than that of C which is greater than that of B.

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