(A)The milligram of the dry material of which the hydrophilic sol is prepared and which, when added to 10 mL of red gold sol, will prevent it from coagulation on the addition of 1 mL of 10 per cent sodium chloride solutionCorrect
(B)The milligram of the dry material of which the hydrophilic sol is prepared and which, when added to 1 mL of red gold sol, will prevent it from coagulation on the addition of 10 mL of 10 per cent sodium chloride solution
(C)The milligram of the dry material of which the hydrophilic sol is prepared and which, when added to 1 mL of red gold sol, will prevent it from coagulation on the addition of 1 mL of 1 per cent sodium chloride solution
(D)None of the above
Answer: (A)
Solution
Gold number is defined precisely as the minimum mass, in milligrams, of a protective (hydrophilic) colloid that must be added to 10 mL of a standard red gold sol to just prevent its coagulation when 1 mL of
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