On addition of one ml solution of 10%NaCl to 10 ml gold sol in the presence of 0.25 gm of starch, the coagulation is just prevented. Starch has the following gold number 

  1. A

    0.025

  2. B

    0.25

  3. C

    0.5

  4. D

    250

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    Solution:

    By definition gold number of starch is the amount of starch in mg added to 10 ml standard gold sol which prevents the coagulation of gold on adding 1 ml of 10% NaCl solution. So the amount of starch is 0.25 g = 250 mg. Hence gold number is 250. 

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