For a reversible reaction,if the concentration of reactants is increased,the equilibrium constant of the reaction

In the given reaction $N_2 + O_2 \rightleftharpoons 2NO$,equilibrium means that

Explain solid-vapour equilibrium by example.

Which one of the following statements is correct?

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

In the reversible reaction,a catalyst is the substance which: