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On addition of 1 ~mL of 10 % NaCl solution to 10 mL gold sol in the presence of 0.025 ~g of starch, the coagulation is just prevented. Starch has gold number

Options

  1. A2.5
  2. B25
  3. C0.25
  4. D0.025

Correct answer

B. 25

Step-by-step solution

Gold Number is the minimum amount of lyophilic colloide in miligrams (starch in given case) which prevents the flocculation of 10 ml gold sol by the addition of 1 ml of 10 % NaCl solution. Gold number = miligram of starch =0.025 10^3 mg =25

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