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On adding 1 mL of solution of 10% NaCl t...

On adding 1 mL of solution of 10% NaCl to 10 mL of gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. The gold number of starch is

A

a) 0.25

B

b) 0.025

C

c) 2.5

D

d) 250

Text Solution

Verified by Experts

The correct Answer is:
D
Gold number is the number of milligrams of a hydrophilic colloid that will just prevent the coagulation of 10 mL of a gold sol on addition of 1 mL of 10% NaCl solution.
`therefore` Gold number = `0.25xx1000`
`=250`
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