A chemical reaction A ⟶B is said to be in equilibrium when: (A) Complete conversion of A to B has taken place (B) Rate of transformation of A to B is equal to B to A. (C) 50% reactant has been changed to B. (D) Conversion of A to B is 50% complete. (E) None of these

Dear STudent,
Chemical equilibrium is the condition where the rate of the forward reaction equals the rate of the reverse reaction, such that the concentrations of reactants and products in a chemical reaction taking place in a closed system no longer change with time.
Therefore option B is correct.
Regards

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