On addition of one mL solution of 10% NaCl to 10 mL gold sol in the pr – InterviewSolution

1.	On addition of one mL solution of 10% NaCl to 10 mL gold sol in the presence fo 0.0250 g of starch, the coagulation is just prevented. Starch has the following gold number
Answer» `0.025` `0.25` `2.5` `25.` SOLUTION :AMOUNT of starch in mg that prevent COAGULATION by 1 ml of `10%` NaCl solution `=0.025xx1000=25.` Hence, gold number =25.

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