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