NEET Chemistry Surface Chemistry Questions Solved


Gold number:

(a) may be defined as the milligram of the dry material of which the hydropholic sol is prepared and which when added to 10 mL of red gold sol, will prevent it from coagulation on the addition of 1mL of 10 percent sodium chloride solution.

(b) may be defined as 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 percent sodium chloride solution.

(c) may be defined as the miligram 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 percent sodium chloride solution

(d) none of the above 

(a) Gold no. is the amount of lyophilic in mg which just protect 10mL. gold sol against coagulation by 1 mL of 10% NaCl solution. It is a measure of protective power of lyophilic colloids.

Difficulty Level:

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