Surface ChemistryMedium

Question

On addition of one ml solution of 10% NaCl to 10 ml red gold sol in the presence of 0.0025 g of starch, the coagulation is just prevented. The gold number of starch is

Options

A.25

B.2.5

C.0.25

D.0.025

Solution

Gold number = 0.0025 × 1000 = 2.5

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