11
Question
On addition of one ml solution of 
to 10 ml gold sol in the presence
of 0.25 gm of starch, the coagulation is just prevented. Starch has the
following gold number
[MP PET/PMT 1988]
On addition of one ml solution of to 10 ml gold sol in the presence
of 0.25 gm of starch, the coagulation is just prevented. Starch has the
following gold number
[MP PET/PMT 1988]
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Solution
The correct option is D 250
By definition gold number of starch is the amount of starch in mg added to 10 ml standard gold sol which prevents the coagulation of gold on adding 1 ml of 10% NaCl solution. So the amount of starch is 0.25g = 250 mg. Hence gold number is 250.
250
By definition gold number of starch is the amount of starch in mg added to 10 ml standard gold sol which prevents the coagulation of gold on adding 1 ml of 10% NaCl solution. So the amount of starch is 0.25g = 250 mg. Hence gold number is 250.
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