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BITSAT2009ChemistrySolutionsActual

The degree of dissociation of Ca ( NO ₃ )₂ in dilute aq. solution containing 7.0 ~g of salt per 100 ~g of water at 100^ C is 70 % . If vapour pressure of water at 100^ C is 760 ~mm Hg . The vapour pressure of solution is

Options

  1. A735
  2. B730
  3. C760
  4. D746

Correct answer

D. 746

Step-by-step solution

Ca ( NO ₃ )₂ Ca ²⁺+2 NO ₃⁻1-0.71 0.7 2 0.7 ( = 70 100 =0.7 ) n ₁= 100 18 =5.55 p ⁰- p _ s p ⁰ = n ₂ i n ₁+ n ₂ , 760- p _ s 760 = 0.042 2.4 5.55+0.042 p _ s -746 ~mm Hg .

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