how to tell when a reaction in equlibrium

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The reaction can occur starting from reactants to products or from products to reactants.Whwn both the reactions occur simultaneously at equal rate then the equilibrium state establishes.

In equilibrium state when there is change in only physical state of reactants and products but no change in their chemical form is called physical equilibrium.

In chemical equilibrium reactants and products undergo chemical change but change in their physical state may or may not be there.This type of reactions always occur in closed system.

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When the rate of forward reaction is equal to the rate of backward reaction, It is said to be in equillibrium.

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