15 cm³ of liquid ‘x’ and 20 cm³ of liquid ‘y’ are mixed at 20ºC and the volume of solution was measured to be 35.1 cm³ then correct reaction is

When 15 cm³ of ‘x’ mixed with 20cm³ of ‘y’, the resultant solution should have a volume of 35cm³. But the solution formed is 35.1cm³. 

$$\begin{gathered} ∆{\mathrm{V}}_{\mathrm{mix}}=+\mathrm{ve} \\ \mathrm{its} \mathrm{is} \mathrm{positive} \mathrm{deviation} \mathrm{form} \mathrm{Raoult}\text{'}\mathrm{s} \mathrm{law} \\ \mathrm{Hence} \\ ∆{\mathrm{H}}_{\mathrm{mix}}=+\mathrm{ve} \end{gathered}$$