Match List-I with List-II
| List-I | List-II | ||
|---|---|---|---|
| Process | Energy Change | ||
| (A) | Heat is evolved | (I) | Chemiluminescent Reaction |
| (B) | Heat is absorbed | (II) | Photochemical Reaction |
| (C) | Light is required | (III) | Endothermic Reaction |
| (D) | Light is evolved | (IV) | Exothermic Reaction |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A) - (IV), (B) - (III), (C) - (II), (D) - (I)
Reactions are named by the form of energy they give out or take in, heat or light.
(A) Heat is evolved — this matches (IV) Exothermic Reaction. “Exo” means out: the reaction releases heat, as in burning or in respiration.
(B) Heat is absorbed — this matches (III) Endothermic Reaction. “Endo” means in: the reaction takes in heat from the surroundings, as in the decomposition of calcium carbonate on heating.
(C) Light is required — this matches (II) Photochemical Reaction. Such a reaction takes place only in light, as in photosynthesis or the decomposition of silver chloride in sunlight.
(D) Light is evolved — this matches (I) Chemiluminescent Reaction. The reaction gives out light with little heat, as in the glow of a light stick or of a firefly.