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Standard XII
Chemistry
NCERT
Question

The vapour pressure will be lowest for
  1. 0.1 M sugar solution
  2. 0.1 M KCl solution
  3. 0.1 M Cu(NO3)2 sollution
  4. 0.1 AgNO3 solution

A
0.1 M sugar solution
B
0.1 M KCl solution
C
0.1 AgNO3 solution
D
0.1 M Cu(NO3)2 sollution
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Solution
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relative lowring of vapour pressure is a colligative property and depends on the number of solute particles present in the solution.

and as relative lowring of vapour pressure is directly proportional vant hoff factor 0.1M Cu(NO3)2 solution has highest i value ultimately, Vapour pressure lowered greatest. thus, has lowest vapour pressure.


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