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On addition of one mL of 10% NaCl soluti...

On addition of one mL of 10% NaCl solution to 10 mL gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. Starch has the gold number

A

0.025

B

0.25

C

2.5

D

none of these.

Text Solution

Verified by Experts

The correct Answer is:
D
By definition, gold number of starch is the amount of starch in milligram added to 10 mL standard gold solution which prevents the coagulation of gold on adding 1 mL of 10% NaCl solution. So the amount of starch is 0.25 g = 250 mg. Hence, gold number is 250.
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