Q. The solubility of common salt is $36.0 \,g$ in $100\, g$ of water at $20^{\circ} C$. If systems, I, II and III contain $40.0,36.0$ and $20.0 \,g$ of the salt added to $100.0 \,g$ of water in each case, the vapour pressures would be in the order
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