
Gold number is minimum in case of
A.Gelatin
B.Egg albumin
C.Gum Arabic
D.Starch
Answer
485.1k+ views
Hint: At first think about the gold number and about the topic where the gold number is present so that you can get some basic idea about the question. Gold number is a term used in colloidal chemistry.
Complete step by step answer:
Gold number is defined as the amount of protective colloid which is just sufficient to prevent coagulation of $10ml$ of a standard hydro gold sol when $1ml$ of $10\% NaCl$ solution is added to it.
Some compounds have a particular range of gold numbers. More is the gold number, less is the protective power of the lyophilic solid. The amount is taken in weight in milligrams.
In the textbooks, the following table is available for us
From the above table, we can say that gelatin has a minimum range of gold numbers compared to egg albumin, gum Arabic, and starch. As gelatin has a minimum gold number it has more protective power.
So the answer is A.
Additional Information:-
The coagulation of gold sol is indicated by a color change from red to blue or purple when particle size just increases. The gold number describes the protective power of colloids.
Note:
If the gold number is more then the protective power is less for the lyophilic sols.If water is used as the dispersion medium, lyophilic sols are called hydrophilic sols. Starch, gum, gelatin, egg albumin etc. are examples of lyophilic sols. Dextrin has a high gold number so it has less protective power.
Complete step by step answer:
Gold number is defined as the amount of protective colloid which is just sufficient to prevent coagulation of $10ml$ of a standard hydro gold sol when $1ml$ of $10\% NaCl$ solution is added to it.
Some compounds have a particular range of gold numbers. More is the gold number, less is the protective power of the lyophilic solid. The amount is taken in weight in milligrams.
In the textbooks, the following table is available for us
Protective Colloid | Gold number |
Gelatin | $0.005 - 0.01$ |
Haemoglobin | $0.03 - 0.07$ |
Egg albumin | $0.15 - 0.25$ |
Potato Starch | $20 - 25$ |
Gum Arabic | $0.15 - 0.25$ |
Dextrin | $125 - 150$ |
From the above table, we can say that gelatin has a minimum range of gold numbers compared to egg albumin, gum Arabic, and starch. As gelatin has a minimum gold number it has more protective power.
So the answer is A.
Additional Information:-
The coagulation of gold sol is indicated by a color change from red to blue or purple when particle size just increases. The gold number describes the protective power of colloids.
Note:
If the gold number is more then the protective power is less for the lyophilic sols.If water is used as the dispersion medium, lyophilic sols are called hydrophilic sols. Starch, gum, gelatin, egg albumin etc. are examples of lyophilic sols. Dextrin has a high gold number so it has less protective power.
Recently Updated Pages
Glucose when reduced with HI and red Phosphorus gives class 11 chemistry CBSE

The highest possible oxidation states of Uranium and class 11 chemistry CBSE

Find the value of x if the mode of the following data class 11 maths CBSE

Which of the following can be used in the Friedel Crafts class 11 chemistry CBSE

A sphere of mass 40 kg is attracted by a second sphere class 11 physics CBSE

Statement I Reactivity of aluminium decreases when class 11 chemistry CBSE

Trending doubts
10 examples of friction in our daily life

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

State and prove Bernoullis theorem class 11 physics CBSE

What organs are located on the left side of your body class 11 biology CBSE

How many valence electrons does nitrogen have class 11 chemistry CBSE
