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Question

Heat is evolved during


A

Endothermic reaction

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B

Displacement reaction

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C

Combination reaction

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D

Exothermic reaction

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Solution

The correct option is D

Exothermic reaction


The correct option is option D

The explanation for the correct option:

  1. An exothermic reaction is a chemical process that is characterized by the release of energy in the form of heat or light.
  2. When bonds are broken, less energy is lost than that is released when new ones are formed. That's why heat is produced to release the extra energy.
  3. The energy released by the reaction is greater than the activation energy required to start it.
  4. The energy lost is released into the environment. As a result, the change in enthalpy (a quantity that measures a system's heat content by calculating the change in energy) is negative in such a process.
  5. Example: Formation of ammonia 3H2Hydrogengas+N2(g)Nitrogengas2NH3(g)Ammoniagas+Heat

The explanation for the incorrect option:

Option (A): Endothermic reaction

  1. Any chemical process that takes heat from its surroundings is said to be endothermic. The reaction's activation energy comes from the energy that was absorbed.
  2. Hence, it is an incorrect option.

Option (B): Displacement reaction

  1. A chemical reaction in which one element in a compound is replaced by another is referred to as a single-displacement reaction. This reaction is also referred to as a single replacement reaction or exchange reaction.
  2. They are a type of exothermic reaction.
  3. Hence, it is an incorrect option

Option (C): Combination reaction

  1. A combination reaction is one in which two or more reactants combine to create a single result.
  2. They can or cannot be exothermic
  3. Hence, it is an incorrect option.

Final answer: Heat is evolved during exothermic reactions.


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