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The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of $K C l, C H_{3} O H$ and $C H_{3} {(C H_{2})}_{11} O S O_{3}^{-} N a^{+}$ at room temperature. The correct assignment of the sketches is

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

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

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

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

answer is D.

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Detailed Solution

s.t is linked with magnitude of intermolecular forces

in I methanol decreases attractions between water

in ii there is increase in s.t with conc,due to increases attractions due to hydration

in iii surfactants decrease the s.t of water drastically

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