Question: one liter of co2 is passed through red hot coke?
Answer: According to the problem, one litre of CO2 reacts with 1 mole of Carbon to produce 2litres of CO. Given 1.4L is the mixtures of gases[CO+unreacted CO2]. If X litres of CO2 are reacts to give 2X litres of CO . Therefore, the composition of product is 0.6 litres of CO2 and 0.8 litres of CO.