Give reasons :

  1. A decrease in temperature is observed on mixing ethanol and acetone.
  2. Potassium chloride solution freezes at a lower temperature than water.

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) Ethanol & acetone forms a non-ideal solution showing positive deviation which is accompanied by absorption of heat and a slight increase in volume, whats why a decrease in temperature is observed.

(b) Potassium chloride solution freezes at a lower temperature than water because the vapour pressure of the solution is less than that of pure solvent, hence the freezing point decreases.

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