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  4. In which case Raoult's law is not applicable?

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Q. In which case Raoult's law is not applicable?

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Solution:

If the total number of particles of solute changes in the solution due to association or dissociation. Raoult's law is not applicable, among the given compounds $NaCl$ undergoes dissociation and forms $Na ^{+}$ and $Cl ^{-}$ ions. Thus, Raoult's law is not applicable to $NaCl$.