Question

A pure substance whose molecules contain two or more atoms, combined together in a definite ratio is called compound.
(A) True
(B) False

Answer 1

Hint: All the chemical compounds are chemical substances. Chemical compounds can be classified into categories like inorganic and organic compounds depending upon the atoms involved in the structure.

Complete step by step answer:
We will get some information about the compound.
- Chemical compound is a substance which has identical molecules made up of atoms of more than one element. The molecules are held together by molecular forces.
e.g. Water (${H_2}O$) , Sodium chloride (NaCl) and Acetic acid ($C{H_3}COOH$)
- Here, we can see that in water, two H atoms and one O atom combines to form a molecule. Also in the case of sodium chloride, we can see that one sodium ion and one chlorine ion form ionic bonds to form a compound.

- Depending upon the type of molecular bonds or forces, they are mainly categorized into four types:
- molecules which are held by covalent bonds
- ionic compounds which are held by ionic bonds
- intermetallic compounds held by metallic bonds
- complexes held by coordinate covalent bonds
- To specify the number of such elements present in a compound, a chemical formula is used.
- Compounds can be converted into other compounds by reactions with another chemical compound which involves breaking of the bonds.
Thus, we can say that the given statement is true.
So, the correct answer is “Option A”.

Note: Remember that the substance needs to be pure in order to be considered as a substance. e.g. When some ions like $N{a^ + }$ and $C{l^ - }$ are dissolved in water, then it cannot be said to be pure and hence we cannot consider them as substances.