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The coagulation of 100 ml of a colloidal solution of gold is completely prevented by the addition of 0.25 g of starch to it before adding 1 ml of 10% Nacl solution . Calculate the gold number of starch .

$(a)\;20\qquad(b)\;0.25\qquad(c)\;2.5\qquad(d)\;25$

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