A) The greater the concentration of the substances involved in a reaction, the lower the speed of the reaction
B) The point of dynamic equilibrium is reached when the reaction rate in one direction just balances the reaction rate in the opposite direction
C) The dissociation of weak electrolyte is a reversible reaction
D) The presence of free ions facilitates chemical changes
Correct Answer: A
Solution :[a] As we increase the concentration of substance, then speed of the reaction increases.
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