At equilibrium, the forward and reverse reactions both continue and the rates of the forward and reverse reactions are equal. Therefore, the correct statements are the (i) and (ii) statements.
In the field of chemistry, equilibrium is the state in which both products and reactants are present in concentrations that won't change, so there's no change in the system's properties. At this state, both reactants and products go on at equal rates, which results in no net change in the number of substances involved. The reaction can be considered completed when it reached equilibrium.
There are two types of chemical equilibrium: homogeneous equilibrium and heterogeneous equilibrium.
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