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The coagulation of 100ml of colloidal so...

The coagulation of 100ml of colloidal solution of gold is completely prevented by addition of `0.25 g` of a substance "X" to it before addition of 1 ml of `10%` NaCI solution. The gold number of "X"is :

A

0.25

B

25

C

250

D

2.5

Text Solution

Verified by Experts

The correct Answer is:
B
Amount of protective colloid added in milligrams
`=0.25xx1000=250` mg
`therefore` By definition , the protective colloid required for 10 mL i.e., gold number `=(250)/(100)xx10=25`
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