JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The coagulation of 10 cm³ of gold sol is completely prevented by addition of 0.025 g of starch to it. The gold number of starch is

(A)0.025
(B)0.25
(C)2.55
(D)25Correct

Answer: (D)

Solution

Gold number is the mass, in milligrams, of protective colloid needed in the standard 10 mL gold sol to just prevent its coagulation on adding 1 mL of 10%

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Question ID VK-144918