NEET Chemistry Surface Chemistry Questions Solved


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

(a) 0.25                     (b) 2.5

(c) 250                      (d) 0.025

Difficulty Level:

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