Question

The sol used in eye lotion is:
A. Silver solution
B. Colloidal magnesium
C. Colloidal gold
D. Colloidal antimony

Answer 1

Hint: We know that for medicinal applications, colloidal solutions can also be employed for different medical conditions depending on the composition of the colloidal solution.

Complete step by step answer:
Colloidal solutions might appear to be homogenous solutions for their particles are invisible to the naked eyes but actually, they are heterogeneous mixtures and their particle size is large enough to scatter the visible light which gives rise to Tyndall effect. This results in different properties of colloids such as:
- Colour: The scattering of visible light by colloid particles can give them color which would depend on many factors such as wavelength of the light or direction of observation.
- Charge: Particles of colloids always carry some charge. For example, sol of titanium oxide has positively charge particles whereas sol of starch has negatively charged particles.
These interesting properties make colloidal solutions very useful for us. We can list some of the applications as follows:
- Industrial use: We have varied products based on colloids such as paint and ink
- Tanning: Animal hides being colloids have positively charged particles, they are soaked in tannin which is also a colloid with negatively charged particles, this process of mutual coagulation is called tanning.
- Water purification: Alum upon addition to the water which has impurities suspended in it can lead to the coagulation of impurities and we get purified water.
- Medicinal use: A silver sol namely argyrol is used in eye lotion. Kalaazar can be treated by using colloidal antimony. Similarly, colloidal gold can be used for intramuscular injection. Milk of magnesia which contains magnesium is used to treat acidity.
From the above discussion, we can infer that it is silver sol which is used in eye lotion.

Therefore, from the above explanation the correct option is (A).

Note:
We have to be careful while using the colloidal solutions for medicinal purposes for they all may be colloids but they have different uses based on what is being used to make the colloidal solution.