1.

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

Answer»

0.025
0.25
0.5
25

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. The amount of starch is 0.025 g = 25 mg. Hence, gold number is 25.


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