A) The entropy of solution formed is higher if the detergent concentration is slightly less than CMC as compared to when its concentration is slightly more than CMC
B) The vapour pressure of a solution of 10 g protein molecules is expected to be more than that of 10 g urea molecules as entropy of urea solution is more.
C) The entropy of pure solid solvent is lesser than entropy of pure liquid solvent but equal to entropy of liquid solution of non-volatile solute.
D) The entropy of colloid molecules decrease on coagulation.
Correct Answer: C
Solution :
| [a] At concentration slightly lesser than CMC, all molecules are present separatly. |
| Above CMC, they form micelles. Number of micelles is less than no. of detergent molecules. So concentration of micelles is less. Hence entropy decreases. |
| [b] Molecular masses of proteins are high as they are polymers. Hence, for same mass of protein and urea in different solution, concentration of urea will be more. So vapor pressure will be more for protein solution. |
| Also, this can be explained in terms of entropy. |
| Entropy of urea solution is more than that of protein solution. So its tendency to go in vapor phase is less. |
| [c] Entropy of pure solid solvent < entropy of pure liquid solvent. |
| < entropy of liquid solution of non-volatile solute. |
| [d] Coagulation means combining together of colloid particles to give precipitate. In this process, obviously entropy decreases. |
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