Based on the nature of chemical equilibrium, the system reached equilibrium first at the time T2.
What is chemical equilibrium?
Chemical equilibrium refers to the state of a reversible chemical reaction in which the rate of forward reaction for the the formation is equal to the rate of backward reaction for the formation of reactants.
In the table of the decomposition reaction given above, the system reached equilibrium first at the time T2 when the concentration of the reactant and products were the same.
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