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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 solution of KCl, CH 3 OH and CH 3 (CH 2 ) 11 + − Na OSO 3 at room temperature. The correct assignment of the sketches is Concentration Surface tension I Concentration Surface tension II Concentration Surface tension III

1. I : KCl II : CH 3 OH III : CH 3 (CH 2 ) 11 + − Na OSO 3
2. I : CH 3 (CH 2 ) 11 + − Na OSO 3 II : CH 3 OH III : KCl
3. I : KCl II : CH 3 (CH 2 ) 11 + − Na OSO 3 III : CH 3 OH
4. I : CH 3 OH II : KCl III : CH 3 (CH 2 ) 11 + − Na OSO 3

Correct answer: I : CH 3 OH II : KCl III : CH 3 (CH 2 ) 11 + − Na OSO 3

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