On addition of 1 mL solution of l0% NaCl to l0 mL gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. The gold number of Starch is

On addition of 1 mL solution of l0% NaCl to l0 mL gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. The gold number of Starch is

  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 milligram added to 10 mL standard gold sol which prevents the coagulation of gold on adding 1 mL of 10% NaCl. So the amount of starch is 0.25 g = 250 gm. Hence gold number is 250.

     

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