Question

Which one of the following is not a compound?
a.) Marble
b.) Ozone
c.) Carborundum
d.) Quicklime

Answer 1

Hint: In order to solve the given problem first we will study the molecular formula and chemical name of each of the given options. We will also study the basic definition and characteristics of a compound. Further on the basis of definition of the compound we will select the option which does not represent a compound.

Complete step by step solution: Option A: Marble
Marble is the chemical name given to the compound calcium carbonate and has the molecular formula $CaC{O_3}$
Marble or calcium carbonate is made up of calcium, carbon and oxygen.
Option B: Ozone
Ozone is a chemical represented as ${O_3}$ and comprises three atoms of oxygen.
Option C: Carborundum
Carborundum is the general name for the compound silicon carbide and has the molecular formula $SiC$ . Carborundum is made by the combination of silicon and carbon.
Option D: quick lime
Quick lime is the general name for the compound calcium oxide and has the molecular formula $CaO$ . Quick lime is made by the combination of calcium and oxygen.
Now let us understand the definition of compound.
A compound is a substance whose each molecule is formed by the combination of two or different elements.
On the basis of analysis of each of the options we can see that each molecule of ozone, Carborundum and quick lime is made up of two or more elements which are mentioned along with. But the molecule of ozone is made up of only one kind of element which is oxygen. So Ozone is not a compound.
Hence, Ozone is not a compound.
So, the correct answer is option B.
Note : In order to solve such problems students must remember the basic difference between a compound and a molecule. Students should also remember the chemical formula for some common molecules and compounds which are mentioned above. Ozone can cause damage to the lungs if inhaled. Relatively small amounts can cause pain in the chest, coughing, shortness of breath and irritation in the throat. Ozone can also intensify chronic respiratory conditions such as asthma and impair the body's capacity to combat breathing infections.