Question

Assertion: The burning of candle is both a physical and chemical change
Reason: Burning of candle melts the wax and hence the physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.
(A) Both Assertion and reason are correct and reason is the correct explanation for assertion.
(B) Both Assertion and reason are correct and reason is not the correct explanation for assertion.
(C) Assertion is correct but reason is incorrect.
(D) Both assertion and Reason are incorrect

Answer 1

Hint: There is a large variety of chemical reactions that takes place around us. The various types of chemical reactions and the following observations are useful to determine whether a chemical reaction has taken place as a change in physical state, evaluation of gas, change in color, and temperature change.

Complete step by step answer:
Physical change: This is limited to a change that makes a difference in the display without changing the composition. Physical change is defined as the change in shape and size of a substance and there is no change in chemical composition, which results in no new substance will form. This change is only a physical and a reversible reaction.
For example: melting of solids to liquids, vaporization of liquids to gases, etc.

Chemical change: This change is defined as the change in which the change occurs in the chemical composition and resulting in the formation of new compounds or substances. This process is an irreversible reaction. For example, decaying matter, combustion reactions, chemical usage battery, etc.
Given the Assertion statement, the burning of a candle is both a physical and chemical change because the burning of a candle converted into wax is a physical change and again wax combines with the atmospheric oxygen changes into carbon dioxide, heat, light. So the Reason statement is correct, which is the correct explanation for the Assertion.
So, the correct answer is “Option A”.

Note: Melting and burning of candles, burning of wood in moisture, etc, such as combustion reactions are the examples of both physical change and chemical change. Decomposition is the reverse process of combination, occurring when a single substance breaks down into two or more different substances.