The value of kc is changed by change in temperature because:

Explanation

The value of Kc, is a constant at a given temperature and represents the ratio of the concentrations of products to the concentrations of reactants at equilibrium. It indicates the extent to which a reaction proceeds in the forward or reverse direction. When the temperature of a system at equilibrium is changed, it affects the equilibrium position. According to Le Chatelier's principle, a system at equilibrium will respond to a change by shifting the equilibrium position in a way that minimizes the effect of the change. In the case of a change in temperature, the system will shift in the direction that either absorbs or releases heat. If the temperature is increased, the system will shift in the endothermic direction to consume the excess heat. This means that the value of Kc will decrease. Conversely, if the temperature is decreased, the system will shift in the exothermic direction to produce more heat, resulting in an increase in the value of Kc.