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The equalitative sketches I, II and III ...

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 III:CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`

B

`I:CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)II:CH_(3)OHIII:KCl`

C

`I:KCl II : CH_(3)(CH_(2))_(11) OSO_(3)^(-)Na^(+)III:CH_(3)OH`

D

`I:CH_(3)OH II: KCl III : CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`

Text Solution

Verified by Experts

The correct Answer is:
D
For `CH_(3)OH` curve : decrease of surface tension progressively due to hydrophobic interaction.
For KCl curve : increase of surface tension because of intermolecular forces of attraction.
For `CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)` : decrease of surface tension before critical micelle concentration (CMC) and then almost unchanged.
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