Question

The equalitative sketches I, II and III given below show the variation of surface tension with molar concentration of three diferent aqueous solutions of `KCl, CH_(3)OH` and `CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)` at room temperature.

The correct assignment of the sketches is
A. I:KCl
II: `CH_(3)OH`
B. I: `CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`
II: `CH_(3)OH`
C. I: `KCl`
I: `CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`
III: `CH_(3)OH`
D. I: `CH_(3)OH`
II: `KCl` ltBrgt III: `CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`

Answer 1

Correct Answer - D
Strong electrolytes like KCl 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