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Standard XI

Chemistry

Electrical Properties of Colloids

The coagulati...

Question

The coagulation of 200 ml of a colloidal solution of gold is completely prevented by adding 0.50 g of starch to it before adding 1 ml of 10% $N a C l$ solution. Calculate the gold number of starch

2.5

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0.25

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250

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Solution

The correct option is B 25
Gold number is the amount of protective colloid in mg that prevents coagulation of 10 ml gold sol on addition of 1 ml of 10% $N a C l$ solution.
Gold number is;
As 200 ml requires 500 mg of starch
10 ml will require,
$\frac{500 \times 10}{200} = 25$

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The coagulation of 200 ml of a colloidal solution of gold is completely prevented by adding 0.50 g of starch to it before adding 1 ml of 10% NaCl solution. Calculate the gold number of starch

The correct option is B 25Gold number is the amount of protective colloid in mg that prevents coagulation of 10 ml gold sol on addition of 1 ml of 10% NaCl solution. Gold number is; As 200 ml requires 500 mg of starch 10 ml will require, 500×10200=25

The coagulation of 200 ml of a colloidal solution of gold is completely prevented by adding 0.50 g of starch to it before adding 1 ml of 10% $N a C l$ solution. Calculate the gold number of starch

The correct option is B 25
Gold number is the amount of protective colloid in mg that prevents coagulation of 10 ml gold sol on addition of 1 ml of 10% $N a C l$ solution.
Gold number is;
As 200 ml requires 500 mg of starch
10 ml will require,
$\frac{500 \times 10}{200} = 25$