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Gold Number

The gold numb...

Question

The gold numbers of some colloidal solutions are given below.
Colloidal solution Gold number
A 0.01
B 2.5
C 20
The protective nature of these colloidal solutions follow the order :

A

C > B > A

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B

A > B > C

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C

A = B = C

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D

B > A > C

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Solution

The correct option is B A > B > C
Smaller the value of gold number, greater will be the protecting power of the protective colloid.
Hence, protective nature of A, B and C is as
Colloidal solution: A > B > C
Gold number : 0.01 > 2.5 > 20

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Q. The gold numbers of some colloidal solutions are given below:

Colloidal solution	Gold number
$A$	$0.01$
$B$	$2.5$
$C$	$20$

The protective powers of these colloidal solutions follow the order:

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 % N a C l

solution. The gold number of “

X

6 \times 10^{- 5}

g of a protective colloid was added to

20

mL of a standard gold sol, the precipitation of latter was just prevented on addition of

2

10 %

N a C l

solution. The gold number of a protective colloid is:

{6 \times 10}^{- 5}

g of a protective colloid was added to a 20ml of standard gold sol, the precipitation of latter was just prevented on addition of 2ml of 10%NaCl solution. The gold number of protective colloid is?

Q. Gold numbers of some colloids are :

0.005 - 0.01

0.15 - 0.25

0.04 - 1.0

15 - 25

Which among these is a better protective colloid?

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