The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aquecous solutions $KCl, {CH}_{3} OH$ and ${CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} {Na}^{+}$ at room temperature. The correct assigment of the sketches

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$\begin{array}{lll} I : {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-}^{-} {Na}^{+} II : {CH}_{3} OH III : KCl \end{array}$

$I) KCl II) {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} {Na}^{+} III : {CH}_{3} OH$

$D) I : {CH}_{3} OH II : KCl III: {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} {Na}^{+}$

$\begin{array}{lll} I : KCl II : {CH}_{3} OH III : {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} {Na}^{+} \end{array}$

answer is D.

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Detailed Solution

For KCl curve – Increase of surface tension for inorganic salts.For CH₃OH curve – Decrease of surface tension progressively for alcohols For ${CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} {Na}^{+}$ curve – Decrease of surface tension before CMC (Critical Micelle Concentration) and then almost unchanged

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