Question

on addition of 1ml solutaion of Nacl to 10ml gold sol in presence of 0.0025g of starch,tha coagulation is just prevented tha gold no. of starch is-

Answer 1

Answer:

250

Explanation:

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 0.25g = 250 mg. Hence gold number is 250.

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