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Question

The relative decrease in the vapour pressure of an aqueous solution containing 2 mol NaCI in 3 mol H2O is 0.5.
This solution, on reaction with AgNO3 will form:-
  1. 1 mol AgCI
  2. 0.25 mol AgCI
  3. 0.5 mol AgCI
  4. 2 mol AgCI


Solution

The correct option is C 0.5 mol AgCI
ΔPP=0.5=i×nn+N
i = 1.25
1.25 = 1 + (2 – 1)α
α = 0.25
2 mol of NaCl will produce 0.5 mol of Cl in solution.

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