KEAM 2020 Physics and Chemistry Solved Paper

The equilibrium constant for the equilibrium PCl5g)⇌PCl3(g)+Cl2(g) at aparticular temperature is 2×10−2‌mol‌dm−3. The number of moles of PCl5 that must be taken in a one-litre flask at the same temperature to obtain a concentration of 0.20‌mol of chlorine at equilibrium is