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Gold number of starch is 25. Amount of starch that should be added to 10 mL of Gold sol in presence of 1 mL of 10% NaCl solution will be


A
250 g
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B
0.025 g
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C
0.25 g
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D
2.5
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Solution

The correct option is B 0.025 g
Amount of starch (in mg) to be added to 10 ml of gold sol to prevent it's coagulation in the presence of 1 ml of 10% NaCl solution is called gold number.
Amount of starch added : 25 mg or 0.025 g

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