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a) Reactants = C(s) and H₂O(g)

Products = CO(g) and H₂(g)

The substances which reacts are called reactants and the substances which formed during reaction are called products.

b) We know that According to Le Chatelier principle if we change the concentration of a system at equilibrium then the system will try to cancel the effect of that change and it will attain a new state of equilibrium. So when we remove the products then product molecules will decrease so the reaction will proceed in a forward direction to attain the equilibrium. And so the products will increase.

Note- Equilibrium is that state when the rate of forward reaction becomes equal to the rate of backward reaction.