Surface ChemistryHard
Question
On addition of one ml solution of 10% NaCl to 10 ml gold sol in the presence of 0.0250 gm of starch the coagulation is just prevented. Starch has the following gold number :
Options
A.0.025
B.0.25
C.2.5
D.25
Solution
Gold number is minimum amount of protective colloid when can protect 10 ml standard gold sol from coagulation when 1 ml of 10% NaCl is added.
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