1.

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

Answer»

0.025
0.25
2.5
none of these.

Solution :By DEFINITION, gold NUMBER of starch is the amount of starch in MILLIGRAM added to 10 mL standard gold solution 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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