The qualitative sketches I, II and III given below show the…

Maths JEE - Advanced Previous Year Paper JEE-Advanced-2016-Paper-2 Single Correct MCQ

Published on: August 13, 2026

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KC1, CH 3 OH and CH 3 (CH 2 ) 11 at room temperature. The correct assignment of the sketches is

Concentration Concentration Concentration

I:KC1 II:CH 3 OH III: CH 3 (CH 2 ) 11

Na +

I:CH 3 (CH 2 ) 11

Na + II: CH 3 OH III: KC1

I:KCl II:CH 3 (CH 2 ) 11

Na + III: CH 3 OH

I:CH 3 OH II:KCl III: CH 3 (CH 2 ) 11

Na +

Text Solution

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The correct answer is:

Strong electrolytes like KC1 increase the surface tension slightly. Low molar mass organic compounds usually decrease the surface tension. Surface active organic compounds like detergents sharply decrease surface tension

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