option (A) Adding heat to the product mixture is the right answer.
As the reactant side has more moles than the product side, the equilibrium of the reaction shifts to the left to decrease pressure by increasing volume.
If the temperature drops, equilibrium also moves to the left.
Given equation is co+ 3h2 ⇌ ch4+ h2o
When heat is added to the product mixture in this situation, equilibrium moves to the left.
A condition where opposing forces or actions are in balance is known as equilibrium.
Equilibrium is of two types:
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