In which case Raoult's law is not applicable?

1 M

N a C l

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1 M

urea

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1 M

glucose

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1 M

sucrose

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Solution

The correct option is A $1 M$ $N a C l$
Raoult's law is not applicable if the total number of particles of solute changes in the solution due to association or dissociation.

Urea, glucose and sucrose are the non-electrolytes. They cannot dissociate into ions.

$N a C l$ dissociates into $N a^{+}$ ions and $C l^{-}$ ions.

Hence, option A is correct.

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