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42 . 12 % (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol is [Given : Molar mass : Na = 23 . 0 g mol - 1 ; Cl = 35 . 5 g mol - 1 ]

Options

  1. A36   mmolL - 1
  2. B36   mol   L - 1
  3. C1440   mol   L - 1
  4. D1440   m   molL - 1

Correct answer

D. 1440   m   molL - 1

Step-by-step solution

The minimum concentration of an electrolyte in millimoles per litre required to cause precipitation of a sol in two hours is called coagulating value. 42 . 12   %   means   100   ml   solution   contain   42 . 12   g   of   salt . moles   of   salt   =   42 . 12 58 . 5   =   0 . 72   moles   =   720   milimoles Since 100 ml required 720 milimoles therefor 1 L will required 7200 milimoles. It will coagulate in 10 hour

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