Gold number is the index for :
Correct answer: D. none of the above.
- A. the amount of gold present in the colloid.
- B. the amount of gold required to break the colloid.
- C. the amount of gold required to protect the colloid.
- D. none of the above.
Explanation
Gold number is 'least quantity of protective colloid in milligrams, which is just sufficient to prevent the coagulation of 10 ml of standard gold sol (containing 0.0053% gold) by the rapid adidition of 1 ml of 10% NaCl solution. The Coagulation of gold sol is indicated by change in color from red to violet. Thus small the gold number, the greater is protective power of lyophilic colloid.
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