Question

Milk of sulphur finds its application
A. Medicines
B. Photography
C. Head of matchstick
D. Vulcanization

Answer 1

We all know about the element sulphur. Sulphur (${\text{S}}$), considered as a secondary element along with calcium and magnesium. It is an essential macronutrient which is required for plant growth. At room temperature it exists as yellow crystalline solid. Sulphur exists in crystalline and amorphous forms. Where rhombic and monoclinic are the allotropes of sulphur in crystalline form. Milk of sulphur and plastic sulphur are the allotropes of sulphur in amorphous form.

Complete step by step answer:
We already came to know that milk of sulphur is an allotrope of sulphur. It is non crystalline and has a white colour.
Milk of sulphur can be prepared by boiling of sulphur with an aqueous solution of calcium hydroxide. The mixture is then filtered and to the filtrate, hydrochloric acid is added . The reaction for the preparation of milk of sulphur is given below
$3\,{\text{Ca}}\,{\left( {{\text{OH}}} \right)_2}\, + \,12\,{\text{S}}\,{\text{ + }}\,{\text{6HCl}}\, \to \,{\text{3CaC}}{{\text{l}}_2}\, + \,12\,{\text{S}}\,\,{\text{ + }}\,{\text{2}}\,{{\text{H}}_2}{\text{O}}$
We already know that dilute solution calcium hydroxide is also called lime water.
Mainly milk of sulphur is used for the preparation of sulphur containing ointment which is used for the treatment of various skin disorders. So milk of sulphur finds its application in medicines.

So, the correct answer is Option A.

Note: Above we said that milk of sulphur is an allotropic form of sulphur. For those who don't know what allotrope is , we can define allotropy as a phenomenon by which an element exists in different physical forms having the same chemical properties.