Q. The solubility of a specific non-volatile salt is $4 \, g$ in $100 \, g$ of water at $25^{\circ} C$. If $2.0 \, g ., 4.0\, g$ and $6.0 \, g$ of the salt added to $100\, g$ of water at $25^{\circ} C$, in system $X, Y$ and $Z$. The vapour pressure would be in the order:
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