Chemistry
Grade-10
Easy

Question

If a reversible reaction is exothermic in the forward direction, it will be …

  1. Exothermic in the reverse direction
  2. Endothermic in the forward direction too
  3. Endothermic in the reverse direction
  4. Not involve energy in reverse direction

Hint:

Chemical equilibrium for reversible reactions involves two opposing processes, one favoring the end product and the other the reactant. Backward reaction will be endothermic if forward reaction is exothermic.
Exothermic - Release of heat
Endothermic- Absorption of energy

The correct answer is: Endothermic in the reverse direction


    If a reversible reaction is exothermic in the forward direction, it will be endothermic in the reverse direction.
    • Chemical processes can reach a dynamic equilibrium and are reversible.
    • The location of equilibrium of a reversible reaction can be shifted by modifying the reaction circumstances.
    • For a reversible reaction, one is the forward reaction and the other is considered as the backward reaction.
    • The forward reactions favor the formation of products and the backward reaction favors the formation of reactants. If one of the reactions is exothermic i,e, accompanied by the release of heat then the other must be endothermic. 
    • The more energy a reaction releases, the less energy is needed for the reaction to cross the energy barrier.
    • The activation energy is the amount of energy needed to pass through the energy barrier.
    • Hence, if forward reaction is exothermic, the backward reaction will be endothermic. 

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