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On addition of one mL solution of 10% Na...

On addition of one mL solution of 10% NaCl to 10mL gold solution in the presence of 0.025 g of starch,the coagulation is prevented because starch has the following gold numbers

A

25

B

0.025

C

0.25

D

2.5

Text Solution

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The correct Answer is:
A
Minium amount of dry protective colloid in milligram which can just prevent the coagulation of 10 mL of red gold sol. On the addition of 1mL of 10% NaCl solution to it.
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