In the dissociation of CaCO3 in a closed vessel, the forward reaction is favoured by

Addition (or) removal of CaCO3, CaO has no  influence on equilibrium state.According to Le-Chatelier's principleAddition of gaseous reactants (or) removal gaseous products favour forward reaction. Removal of CO2 (g)  favour forward reaction. Removal CO2 (g) favours the decomposition of CaCO3Forward reaction involves increase in volume. favoured at low pressure. only option (4) is correct.