The qualitative sketches I, II and ...
Question
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,CH_3OH
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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 ( mathrm{KCl}, mathrm{CH}_{3} mathrm{OH} ) and ( mathrm{CH}_{3}left(mathrm{CH}_{2}right)_{11} mathrm{OSO}_{3}^{-} mathrm{Na}^{+} ) at room temperature.
The correct assignment of the sketches is
(a) ( mathrm{KCl} ) ( mathrm{CH}_{3} mathrm{OH} ) ( mathrm{CH}_{3}left(mathrm{CH}_{2}right)_{11} mathrm{OSO}_{3}^{-} mathrm{Na}^{+} )
(b) ( mathrm{CH}_{3}left(mathrm{CH}_{2}right)_{11} mathrm{OSO}_{3}^{-} mathrm{Na}^{+} mathrm{CH}_{3} mathrm{OH} quad) ( mathrm{KCl} )
(c) ( mathrm{KCl} quad) ( mathrm{CH}_{3}left(mathrm{CH}_{2}right)_{11} mathrm{OSO}_{3}^{-} mathrm{Na}^{+} quad mathrm{CH}_{3} mathrm{OH} )
(d) ( mathrm{CH}_{3} mathrm{OH} quad) ( mathrm{KCl} ) ( quadmathrm{CH}_{3}left(mathrm{CH}_{2}right)_{11} mathrm{OSO}_{3}^{-} mathrm{Na}^{+} )

JEE/Engineering Exams
Chemistry
Solution
75
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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,CH_3OH and CH_3(CH_2)_11OSO_−3Na+ at room temperature. The correct assignment of the sketches is
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I ( left(mathrm{CH}_{3} mathrm{OH}right): ) Surface tension decreases as concentration increases.

II (KCI) : Surface tension increases with concentration for ionic salt. 

( mathrm{III}left[mathrm{CH}_{3}left(mathrm{CH}_{2}right)_{11} mathrm{OSO}_{3}^{-} mathrm{Na}^{+}right]: ) It is an anionic detergent.
There is decrease in surface tension before micelle formation, and after CMC (Critical Micelle Concentration) is attained, no change in surface tension.

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