Gold Number
Trending Questions
Q. 10−4 g of gelatin is required to be added to 100 cm3 of a stanadard gold solution to just prevent its precipitation by addition of 1 cm3 of 10% NaCl solution to it. Hence, gold number of gelatin is?
- 0.1
- 10
- 1
- 0.01
Q. The coagulation of 100ml of colloidal solution of gold is completely prevented by addition of 0.25g of a substance of X to it before adding 1ml of 10% NaCl solution. the gold number of "X" is-
- 2.5
- 0.25
- 25
- 250
Q.
On the addition of 1 ml. of 10% solution of sodium chloride to 10 ml. of gold sol in presence of 0.025 g of starch, the coagulation is just prevented. The gold number of starch is
0.25
2.5
25
0.025
Q. The coagulation of 100 mL of a colloidal solution of gold is completely prevented by addition of 0.25 gm of a substance "X" to it before the addition of 1 mL of a 10% NaCl solution. The gold number of "X" is :
- 0.25
- 2.5
- 25
- 250
Q.
The gold numbers of protective colloids A, B, C and D are 0.04, 0.004, 10 and 40 respectively. The protective powers of A, B, C and D are in the order:
A > B > C > D
B > A > C > D
D > C > A > B
D > C > B > A
Q. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols.
Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.
Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a 10% solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.
The coagulation of 100 mL of colloidal solution of gold is completely prevented by the addition of 0.25 g of a substance “X” to it before the addition of 1 mL of 10% NaCl solution. The gold number of “X” is
Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.
Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a 10% solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.
The coagulation of 100 mL of colloidal solution of gold is completely prevented by the addition of 0.25 g of a substance “X” to it before the addition of 1 mL of 10% NaCl solution. The gold number of “X” is
- 0.25
- 250
- 2.5
- 25
Q. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols.
Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.
Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a 10% solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.
Gold number of hemoglobin is 0.03. Hence 100 mL of gold sol will require what amount of hemoglobin (in g) so that gold is not coagulated by 1 mL of 10% NaCl solution
Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.
Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a 10% solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.
Gold number of hemoglobin is 0.03. Hence 100 mL of gold sol will require what amount of hemoglobin (in g) so that gold is not coagulated by 1 mL of 10% NaCl solution
- 3×10−3 g
- 3×10−2 g
- 3×10−1 g
- 3×10−4 g
Q. 10−4 g of gelatin is required to be added to 100 cm3 of a stanadard gold solution to just prevent its precipitation by addition of 1 cm3 of 10% NaCl solution to it. Hence, gold number of gelatin is?
- 10
- 0.01
- 1
- 0.1
Q.
On the addition of 1 ml. of 10% solution of sodium chloride to 10 ml. of gold sol in presence of 0.025 g of starch, the coagulation is just prevented. The gold number of starch is
0.025
0.25
2.5
25
Q. The coagulation of 100ml of colloidal solution of gold is completely prevented by addition of 0.25g of a substance of X to it before adding 1ml of 10% NaCl solution. the gold number of "X" is-
- 0.25
- 25
- 250
- 2.5
