On addition of 0.5 mL of solution of 10% NaCl to 20 mL of red gold sol in presence of 0.025 g of starch, the coagulation is just prevented. The gold number of starch is

On the addition of 1 ml. of 10% solution of sodium chloride to 10 ml. of gold sol in presence of 0.025 g of starch, the coagulation is just prevented. The gold number of starch is

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On addition of one mL solution of 10% NaCl to 10mL gold sol in presence of 0.025g of starch, the coagulation is just prevented. The gold number of starch is:

The correct option is A 25.0Gold number of a protective colloid is a minimum weight of it in milligrams which must be added to 10ml of a standard red gold sol so that no coagulation of the gold sol occurs. Hence, the gold number of NaCl is 25.0.

On addition of one $m L$ solution of $10$ % $N a C l$ to $10 m L$ gold sol in presence of $0.025 g$ of starch, the coagulation is just prevented. The gold number of starch is:

The correct option is A $25.0$
Gold number of a protective colloid is a minimum weight of it in milligrams which must be added to 10ml of a standard red gold sol so that no coagulation of the gold sol occurs. Hence, the gold number of $N a C l$ is 25.0.