JEE Main Chemistry question

Chemistry Solutions JEE Main

Among the following 0.1 m aqueous solutions, identify the one to which the simple (non-volatile-solute) form of Raoult's law for relative lowering of vapour pressure does NOT strictly apply. [UP SEE 2005]

(A)0.1 m sucrose
(B)0.1 m urea
(C)0.1 m ethanolCorrect
(D)0.1 m glucose

Answer: (C)

Solution

The simple relative-lowering-of-vapour-pressure form of Raoult's law, , strictly assumes the solute itself is non-volatile. Sucrose, urea and glucose are all non-volatile, non-dissociating solutes under ordinary conditions, so this simple law applies to each. Ethanol, however, is itself

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Question ID VK-143043