How does a catalysts affects the equilibrium constant?

Pick the correct statement from the following: the addition of a catalyst changes equilibrium constant., a catalyst speeds up the forward reaction but slows down the reverse reaction., the composition of equilibriụm is changed by catalyst., addition of catalyst does not change the equilibtium concentrations

For the reaction, 2NO_(g) + O_(2(g)) harr 2NO_(2(g)) . The equilibrium constant is K. Then predict the equilibrium constants for the following reactions. More O_2 is added to the equilibrium.

For the reaction, 2NO_(g) + O_(2(g)) harr 2NO_(2(g)) . The equilibrium constant is K. Then predict the equilibrium constants for the following reactions. 2NO_2 harr 2NO + O_2

For the reaction, 2NO_(g) + O_(2(g)) harr 2NO_(2(g)) . The equilibrium constant is K. Then predict the equilibrium constants for the following reactions. 4NO + 2O_2 harrr 4NO_2

For the reaction, 2NO_(g) + O_(2(g)) harr 2NO_(2(g)) . The equilibrium constant is K. Then predict the equilibrium constants for the following reactions. NO + 1/2O_2 harr NO_2

What do you mean by equilibrium constant?

The equilibrium constant of a reaction is 200. If the volume of the reaction flask is tripled, the equilibrium constant will be