Question

Which of the following is a carbonate ore?
A. Pyrolusite
B. Malachite
C. Diaspore
D. Cassiterite

Answer 1

First we should be aware with each and every ore so that we can distinguish. Carbonate ore is an ore with a $C{O_3}$ component, they are generally both aqueous and no-aqueous in nature. In this set of options there is only one ore which is carbonate, therefore after writing the chemical formulas we can easily get it by comparing.

Complete step by step answer:
-Pyrolusite is the name of the ore of the Manganese. Its chemical formula is $Mn{O_2}$ .It is one of the most important ores of the Manganese. It also consists of many other oxides in it. It is black in colour. Its texture is amorphous and it appears to be fibrous, granular of columnar based on formation.
-Malachite is the name of the ore of the Copper. Its chemical formula is $C{u_2}C{O_3}{(OH)_2}$ .It is one of the most important ores of the Copper. It is a carbonate ore. It is mainly found in Democratic Republic Of Congo. It is greenish in colour. Its texture is crystalline, in monoclinic form that often forms fibers.
-Diaspore is the name of the ore of the Alumunium. Its chemical formula is $\alpha - AlO(OH)$ .It is one of the most important ores of the Alumunium. It is found in many shapes . It is generally multicolour with predominantly golden grey in colour. Its texture is crystalline, orthorhombic and isomorphous with goethite.
-Cassiterite is a tin oxide mineral. Its chemical formula is $Sn{O_2}$ .It is one of the most important ores of the Tin. It is found in many shapes . It is generally black and grey in colour. Its texture is crystalline, an orthorhombic system and pyramid.
So, the correct answer is “Option B”.

Note: Ores are the raw found substances. Though they chemically exist in compound form, physically they are found along with many unnecessary compounds and substances which are taken away after the process of the extraction.