What happens to the rate of a reaction as the reaction progresses? O A. The rate increases as products are formed.
O B. The rate stays constant throughout the reaction.
O C. The rate is constant until it suddenly drops to zero.
O D. The rate decreases as reactants are used up.

D. The rate decreases as reactants are used up.

Explanation:

Initially, the rate increases until the reaction is at equilibrium. At equilibrium, the rate is constant.

As the reaction progresses, the rate decreases to zero when reactants are used up ( for irriversible reactions only )

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