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Q.

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,CH3OH  and  CH3(CH2)11OSO3−Na+  at room  temperature. The correct assignment of the sketches is

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a

I: KCl                   II:CH3OH                      III:CH3CH211OSO3−Na+

b

I:CH3(CH2)11OSO3−Na+          II:CH3OH          III:KCl

c

I: KCl           II: CH3(CH2)11OSO3−Na+                     III: CH3OH

d

I:CH3OH                II:KCl                 III: CH3(CH2)11OSO3−Na+

answer is D.

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Detailed Solution

Surface tension deepens on attractive forces holding the size together .I CH3OH+H2O→+ve  deviation sol's   II   KCl+H2→monovolatile  solution III    micelle formation
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