The equilibrium constant is the ratio of the concentration of the products and the reactants. Thus, option a is accurate.
The equilibrium constant is the reaction quotient of the products of the reactants of the reaction mixture. It is represented by K and varies at different temperatures.
At different temperatures, the value of K varies as the reaction shifts when the temperature is increased or decreased. Also, the value of the K is not always close to 1.
Therefore, option a ratio of concentration is accurate.
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