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    can someone explain why the answer is B????? and what is the difference between B and C??
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    The graph shows the definition of a dynamic equilibrium. This means that the rate of the forward reaction is equal to the rate of the backward reaction. The gradient is equal to the rate and on B this reduces/increases until a constant gradient signifying dynamic equilibrium.

    The answer is not C because the question state equilibrium is reached a t(temperature). On graph C this occurs when the gradient is still changing. It would need to be further along to be the correct answer. On B the line is in the right place.
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