For any reversible reaction,if the concentration of the reactant increases,what is the effect on the equilibrium constant?

Which statement for the equilibrium constant is true for the reaction $A + B \rightleftharpoons C$?

The equilibrium of the reaction $x \rightleftharpoons y$ is attained when......

The equilibrium constant for the reaction ${N_{2(g)}} + {O_{2(g)}} \rightleftharpoons 2NO_{(g)}$ at $2000 \, K$ is $4 \times 10^{-4}$. If the equilibrium is attained $10$ times faster in the presence of a catalyst,the equilibrium constant at $2000 \, K$ in the presence of the catalyst will be .................

In a reversible reaction at equilibrium between two reactants,if the concentration of the reactants is doubled,the equilibrium constant ..........

How many types of equilibrium are there based on the proportion of reactant and product?