Question

The following table classifies substances into combustible and non-combustible substances.
$$\begin{array}{cc}\text{Combustible}& \text{Non-combustible}\\ \text{Wood}& \text{Glass}\\ \text{Paper}& \text{Charcoal}\\ \text{Kerosene}& \text{Stone}\end{array}$$ Which of the above entries is not listed correctly?

• A. Paper
• B. Kerosene
• C. Glass
• D. Charcoal

Answer 1

The correct option is D Charcoal

Combustion is a chemical process in which a substance reacts with oxygen to generate heat. The substances that undergo combustion are called combustible substances and those that do not undergo combustion are called non-combustible substances.
Since, charcoal undergoes combustion, it is a combustible substance. Hence, it is listed incorrectly in the table.