The vapour pressure of water at $23^{\circ}$ is $19.8\;mm. 0.1$ mole of glucose is dissolved in $178.2\;g$ of water. What is the vapour pressure (in mm) of the resultant solution ?

Question

$$\begin {array} {1 1} (a)\;19.0 & \quad (b)\;19.602 \\ (c)\;19.402 & \quad (d)\;19.202 \end {array}$$