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The coagulation of 10 cm 3 of Gold sol by 1 ml 10% NaCl solution is completely prevented by addition of 0.25 g of starch to it. The gold number of starch is-

Options

  1. A0.025
  2. B0.25
  3. C2.5
  4. D250

Correct answer

D. 250

Step-by-step solution

0.25 gm prevents coagulation of 10 ml of gold sol by 1 ml of 10% NaCl ∴ milligrams at starch = 250 ∴ Gold number = 250

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