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Applications of Colloids

Gold number o...

Question

Gold number of potato starch is $25$ . Weight of potato starch required to prevent coagulation of $100 m l$ of gold sol by the addition of $1 m l$ of $10 % N a C l$ is

25 g

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2.5 g

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0.005 g

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0.25 g

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Solution

The correct option is D $0.25 g$
Amount of Starch added to 100 ml of gold sol required to prevent coagulation of 1mL of 10% NaCl sol = 0.25 g

Starch required to be added to 10 mL Gold sol to completely prevent coagulation by 1mL of 10% NaCl solution = \dfrac{25}{100} \times 10$ = 25 mg

So Gold Number = 25

So 0.25 g of Starch is required.
Option D is correct

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Gold number of potato starch is 25. Weight of potato starch required to prevent coagulation of 100 ml of gold sol by the addition of 1 ml of 10% NaCl is

Gold number of potato starch is $25$ . Weight of potato starch required to prevent coagulation of $100 m l$ of gold sol by the addition of $1 m l$ of $10 % N a C l$ is