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

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

Predict which of the following reactions will have an appreciable concentration of both reactants and products:
$(a)$ $Cl_{2(g)} \longleftrightarrow 2Cl_{(g)};$ $K_{c}=5 \times 10^{-39}$
$(b)$ $Cl_{2(g)}+2NO_{(g)} \longleftrightarrow 2NOCl_{(g)};$ $K_{c}=3.7 \times 10^{8}$
$(c)$ $Cl_{2(g)}+2NO_{2(g)} \longleftrightarrow 2NO_{2}Cl_{(g)};$ $K_{c}=1.8$

When the rate of the forward reaction is equal to the rate of the backward reaction,the state is known as.......

For a reversible reaction involving two reactants,if the concentration of the reactants is doubled,the equilibrium constant will:

Which of the following is not a characteristic property of chemical equilibrium?