Question

What will be the product, if dilute hydrochloric acid is added to$FeS$?
(a)- Element
(b)- Mixture
(c)- Compounds
(d)- None of these

Answer 1

Hint: When the compound hydrochloric acid is reacted with ferrous sulfide, the products formed are ferrous chloride and hydrogen sulfide. Both the products are made up of two elements.

Complete step by step answer:
Earlier an element was defined as the simplest form of a pure substance which has a decided physical and chemical property and which can neither be split into nor built from simple substances by any chemical or physical method.
The modified definition of the element is: An element is defined as a pure substance that contains only one kind of particle. These particles are known as atoms.
Compounds are pure substances containing more than one kind of element or atoms.
A compound is a pure substance which contains two or more than two elements combined in a fixed proportion by mass and which can be converted into its constituent elements by suitable chemical or physical methods. The properties of a compound are completely different from the properties of the elements from which it is made.
A material which contains two or more substances (elements or compounds) in any proportion is called a mixture. The properties of a mixture have the same properties of its constituents. Further, for separating a mixture, simple physical methods can be used.
When hydrochloric acid is reacted with $FeS$ it forms ferrous chloride and ${{H}_{2}}S$

The reaction is:
$FeS+2HCl\to FeC{{l}_{2}}+{{H}_{2}}S$

In $FeC{{l}_{2}}$ two elements i.e., iron and chlorine, combine. Hence, it is a compound.
In ${{H}_{2}}S$ two elements i.e., hydrogen and sulfur, combine. Hence, it is a compound.
So, the correct answer is “Option C”.

Note: There are three types of elements: metals, non-metals, and metalloids. Compounds are two types: organic compound and an inorganic compound. The mixture is also of two types: homogeneous mixture and heterogeneous mixture.