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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 KCl, $C H_{3} O H a n d C H_{3} {(C H_{2})}_{11} O S O_{3}^{-} N a^{+}$ at room temperature.
The correct assignment of the sketches is

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$I - {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} Na, I I - M e t h a n o l, I I I - K C l$

$I - M e t h a n o l, I I - K C l, I I I - {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} Na$

$I - K C l, I I - {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} Na, I I I - M e t h a n o l$

$I - K C l, I I - M e t h a n o l, I I I - {CH}_{3} {({CH}_{2})}_{11} {OSO}_{3}^{-} Na$

answer is C.

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Detailed Solution

Surface tension decreases by adding hydrophobic tail with hydrophilic head.

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