Question

Which among the following is associated with iron sulfide?
A.Element
B.Mixture
C.Compound
D.None of these

Answer 1

Hint: Iron is an element of group VIII of the periodic table. It is lustrous, ductile, malleable and silver grey in color. It reacts with various elements to form different compounds. Moreover, it is the tenth most abundant element in the universe.

Complete step by step answer:
Iron is basically a chemical element with atomic number 26 and symbol Fe. It is a metal that belongs to the first transition series and group 8 of the periodic table. Now, iron reacts with sulfide to form a compound known as iron sulfide. This compound is obtained by heating iron and sulfur. The reaction is as shown:
$Fe + S \to FeS$
Now, iron sulfide further reacts with hydrochloric acid and thus releasing hydrogen sulfide. Further, in moist air, the iron sulfides oxidize to hydrated ferrous sulfate. The reactions are as shown:
$FeS + 2HCl \to FeC{l_2} + {H_2}S$
$FeS + {H_2}S{O_4} \to FeS{O_4} + {H_2}S$
Moreover, when iron sulfide is exposed to oxygen, it reacts rapidly and releases large amounts of heat. This exothermic reaction can be an ignition source for any oil or gas that is present. Further, the oxygen in the air reacts with exposed iron sulfide and eventually reaches a temperature that can cause hydrocarbons to ignite.
Therefore, iron sulfide is a compound.

Hence, option C is correct.

Note: Iron filings and Sulphur both are considered as elements. We can further separate the mixture of these two by using a magnet. We will observe that the iron filings will stick to the magnet leaving the sulfur powder behind.