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Question

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


A

0.025

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B

0.25

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C

2.5

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D

25

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Solution

The correct option is A

0.025


Minimum mass (mg) of lyophilic sol to be added to 10 ml of gold sol which can prevent from coagulation on addition upon 1 ml of 10% NaCl solution is called gold number which is 0.025 in this case.


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