Question

The reaction, in which heat is also generated along with the formation of product, is called

• A. Endothermic
• B. Oxidation
• C. Photosynthesis
• D. Exothermic

Hint:

Exothermic reactions release energy, while endothermic reactions absorb energy. Combustion, respiration, and neutralization are classic exothermic reactions.

Answer 1

The Correct Option is D

Step 1: Conceptual Background:
Chemical reactions can be broadly classified into two types based on heat energy:
Exothermic reactions: Reactions that release energy (mainly heat) to the surroundings. These reactions feel warm/hot.
Endothermic reactions: Reactions that absorb energy from the surroundings. These feel cool as they consume heat.
Step 2: Analysis of Options:
(A) Endothermic $\rightarrow$ Absorbs heat, so incorrect.
(B) Oxidation $\rightarrow$ Can be exothermic, but not the general classification term here.
(C) Photosynthesis $\rightarrow$ Endothermic process as it requires sunlight (energy input).
(D) Exothermic $\rightarrow$ Correct, since the question specifically asks about heat being generated during product formation.
Step 3: Examples:
Combustion of fuels: \[ CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O + \text{Heat} \]
Neutralization reaction (acid + base): \[ HCl + NaOH \rightarrow NaCl + H_2O + \text{Heat} \]
Step 4: Final Answer:
The reaction in which heat is produced along with the product is called an Exothermic reaction.