At a constant temperature the concentration of a reactant is increased at equilibrium, the equilibrium constant

Explanation

Option B is correct.The equilibrium constant will remain unaffected at constant temperature. The equilibrium constant is a measure of the relative rates of the forward and backward reactions at equilibrium. It is a constant for a particular reaction at a given temperature and is not affected by the initial concentrations of the reactants and products. When the concentration of a reactant is increased, the reaction will shift to the right to produce more products. However, the equilibrium constant will remain the same. This is because the equilibrium constant is a measure of the relative rates of the forward and backward reactions, not the concentrations of the reactants and products. For example, consider the reaction: A + B <=> C + D If we increase the concentration of A, the reaction will shift to the right to produce more C and D. However, the equilibrium constant, K, will remain the same. This is because the equilibrium constant is a measure of the relative rates of the forward and backward reactions. The rate of the forward reaction will increase when the concentration of A is increased, but the rate of the backward reaction will also increase. The equilibrium constant is a measure of the ratio of these two rates, and it will not change when the concentration of A is increased.