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Question

The protective power of the lyophilic colloids is expressed in terms of gold number a term introduced by Zsigmondy. Gold number is the number of milligram of the protective colloid which prevents the coagulation of 10 mL of red gold sol. When 1 mL of a 10% solution of sodium chlorideis added to it. Thus, smaller the gold number of lyophilic colloid, the greater is the protective power.

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

A
2.5
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B
0.25
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C
0.025
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D
25
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Solution

The correct option is D 25
Gold number is the number of milligram of the protective colloid which prevents the coagulation of 10 mL of red gold sol. When 1 mL of a 10% solution of sodium chlorideis added to it.

Protective colloid =0.025 g1 mL of 10% NaCl+10 mL gold sol
According to the definition of gold number:
Gold number=0.025×1000 mg=25 mg


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