Question

What is an ore of potassium?
(A) Bauxite
(B) Dolomite
(C) Carnallite
(D) Cryolite

Answer 1

Hint: In the above question, we have found out the ore of potassium. Potassium ore is mainly mined in Russia, Canada, Germany, Israel and France. So, we have to look for the geometrical location of these ores along with their chemical formula.

Complete Step by step solution
In the above question, since we have to find the ore of potassium let us have a look at each one of them chemical formulas and descriptions.
Bauxite is a rock which is formed by laterite solid which is a reddish clay material. It is commonly found in the tropical or subtropical region. It is aluminium rich ore that is used for aluminium production. The chemical formula of bauxite is $ {\text{A}}{{\text{l}}_{\text{2}}}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{4}}} $ .
Dolomite is a magnesium ore with general formula $ {\text{MgC}}{{\text{O}}_{\text{3}}}{\text{.CaC}}{{\text{O}}_{\text{3}}} $ . The extraction of magnesium from dolomite ore can be done by leaching process. The magnesium can be extracted from dolomite by using hydrochloric acid solutions.
Carnallite is a reddish rock of magnesium and potassium. This is mainly found in German and Spain. It is an important source of potassium. The chemical formula of Carnallite is $ {\text{C}}{{\text{l}}_{\text{3}}}{{\text{H}}_{{\text{12}}}}{\text{KMg}}{{\text{O}}_{\text{6}}} $ .
Cryolite is also known as sodium hexafluoroaluminate. It is an uncommon mineral found on the west coast of Greenland. It is the only product on Earth which is mined to its extinction. The chemical formula of cryolite is $ {\text{N}}{{\text{a}}_{\text{3}}}{\text{Al}}{{\text{F}}_{\text{6}}} $ .
So, the correct option is option C.

Note
-Potassium is used as a fertiliser as potassium is very important for plant growth.
-Potassium is also used in soap, detergents, gold mining, glass production and many more.