In the chemical reaction $N_2 + 3H_2 \rightleftharpoons 2NH_3$ at equilibrium point,state whether:

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

At what change in Gibbs free energy $(\Delta G)$ does a reaction reach equilibrium?

For the reaction $H_2O_{(s)} \rightleftharpoons H_2O_{(l)}$ at $0\,^\circ C$ and normal pressure:

One mole of $A_{(g)}$ is heated to $200^{\circ} C$ in a one litre closed flask,until the following equilibrium is reached:
$A_{(g)} \rightleftharpoons B_{(g)}$
The rate of forward reaction at equilibrium is $0.02 \ mol \ L^{-1} \ min^{-1}$. What is the rate (in $mol \ L^{-1} \ min^{-1}$) of the backward reaction at equilibrium?

Which of the following nitrogen oxides is the most stable?