Question

Respiration is an example of which reaction.
(A) Oxidation.
(B) Decomposition.
(C) Exothermic.
(D) Both A and B

Answer 1

Hint: In the above question, it is asked about respiration belonging to which type of reaction. Respiration is a process where the glucose present inside the body is converted to carbon dioxide and water.

Complete step by step solution:
Respiration can be defined as conversion of glucose to carbon dioxide and water in the presence of oxygen.
Mathematically, Glucose + Oxygen = carbon dioxide + water.
Let us discuss each of the option:
Oxidation:
It is the process where loss of electrons takes place. Cellular respiration is an oxidation-reduction or redox reaction. Respiration is a set of metabolic reactions, where there is both loss and gain of electrons. Hence, this option is not correct.
Decomposition:
A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. Only one reactant is involved here. So, this option is not correct.
Exothermic:
The reaction where energy is released is known as exothermic. Respiration involves the burning of sugar with oxygen, within the cells of every living organism to produce the energy needed for all the reactions of life along with water and carbon dioxide as waste products. Hence, we can say that respiration is an exothermic reaction.
Hence, we can conclude since respiration is an exothermic reaction.
So the correct option is option C.

Note:
We can predict the reaction is exothermic or not using a thermometer. If the temperature of the thermometer rises during the reaction, we can conclude that it is an exothermic reaction.