When a system, $\mathrm{A}\left(\mathrm{g}\right)\rightleftharpoons \mathrm{B}\left(\mathrm{g}\right),$is in equilibrium state, true statement is

The concentration of products is equal to the concentration of the reactants

The ratio of the product of active masses of products and reactants remains constant

Number of moles of reactants and products are equal

The ratio of rate constants of the forward and backward reaction is always unity