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Question

When 6×105 g of a protective colloid was added to 20 mL of a standard gold sol, the precipitation of latter was just prevented on addition of 2 mL of 10% NaCl solution. The gold number of a protective colloid is:

A
3
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B
3×105
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C
0.06
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D
0.03
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Solution

The correct option is D 0.03
In the given problem, to prevent the coagulation of 20 ml of standard gold sol by the rapid addition of 2 ml of 10% NaCl solution, we added 0.00006 grams of colloid. Therefore, to prevent the coagulation of 10 ml of standard gold sol by the rapid addition of 1 ml of 10% NaCl solution, we would need 0.00003 grams of colloid.

Gold number of colloid = 0.00003×1000 milligrams
= 0.03

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