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Question

Which of the following plot correctly represents the variation of concentration of a surfactant (e.g. sodium doedecyl sulphate) versus molar conductivity with regard to behavior at CMC?



A
a
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B
b
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C
c
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D
d
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Solution

The correct option is A a
The molar conductivity varies as shown in plot a). With increase in concentration below CMC, molar conductivity keeps on decreasing. After CMC, the decrease becomes steeper and a discontinuity is observed at CMC.

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