Question

Which of the following compounds are sulphide ores?
(A) Copper pyrites
(B) Iron pyrites
(C) Galena
(D) All

Answer 1

Hint : Sulphide ore means an ore in which the main composition of the compound consists of sulphur. As the name suggests, copper pyrite is ore of copper, iron pyrite is ore of iron and galena is ore of lead.

Complete Step By Step Answer:
Let us first list out the chemical compositions of the ores given in the options.
Copper pyrites - $CuFe{{S}_{2}}$
Iron pyrites - $Fe{{S}_{2}}$
Galena - $PbS$
As it can be seen, all of these ores contain sulphur in their chemical composition which makes them sulphides.
Copper pyrite is an ore of copper and it is the most abundant ore mineral of copper found. It is also known as Chalcopyrite and has a golden yellow colour.
Iron pyrite is an ore of iron and it is the most abundant sulphide mineral. It is also known as ‘fool’s gold’ as it resembles gold.
Galena is an ore of lead and is the most important ore of lead, also it is an important source of silver as it contains about 1 to 2% of silver. It is also known as lead glance.
The correct answer to this question is option D, all. All of the ores given are sulphide ores, they all contain sulphur in their chemical composition.

Note :
Here, ore might also be considered as mineral at some points. Pyrite is a name specifically assigned to $Fe{{S}_{2}}$ , so if any name of the ore contains pyrite in it, it contains $Fe{{S}_{2}}$ in the chemical composition with the element whose ore is mentioned.