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Arrhenius Equation

Gold number g...

Question

Gold number gives an indication of :

A

protective nature of colloids

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B

purity of gold in suspension

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C

the charge on a colloidal solution of gold

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D

g - mole of gold per litre

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Solution

The correct option is A protective nature of colloids
The gold number is the number of milligrams of the protective colloid which prevent the coagulation of $10$ ml of red gold sol when $1$ ml of a $10$ per cent solution of sodium chloride is added to it.

So, lower the gold number, more is the protective power of colloidal sols.

Hence, the correct answer is option $A$ .

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Similar questions

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 nature of these colloidal solutions follow the order :

{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?

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:

Q. If gold number for a protective colloid is

0.08

then how many milligrams would be needed to protect

50 m l

of a standard gold sol from being coagulated on addition of

5 m l

10

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

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