JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Gold number gives

(A)The amount of gold present in the colloid
(B)The minimum amount (in mg) of a protective colloid that must be added to 10 mL of a gold sol to just prevent its coagulation when 1 mL of 10% NaCl solution is added to itCorrect
(C)The amount of gold required to break the colloid
(D)None of the above

Answer: (B)

Solution

Gold number is a quantitative measure of the protective power of a lyophilic colloid: it is defined as the minimum mass, in milligrams, of that protective colloid needed in 10 mL

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Question ID VK-144776