One litre of a mixture of CO and CO₂ is passed over red hot coke when the volume increased to 1.6 L under the same conditions of temperature and pressure. The volume of CO in the original mixture is

Volume of gaseous mixture of CO & CO₂ = 1 lit

Volume of the gaseous mixture after passing over red hot coke = 1.6 lit

CO₂ reacts with red hot coke but not CO

Let the volume of CO₂ in the initial mixture = 'V' lit

then the Volume of CO in the initial mixture = (1 - V) lit

X = '2V' liters

Volume of CO formed due to reduction of CO₂ = 2 'V' liters

Volume of CO initially present in the mixture = (1 - V) liters

Total volume of gaseous mixture after the reaction = 2V + (1 - V)

= (1 + V) lit

Given (1 + V) lit = 1.6 lit

V = 0.6 lit

Volume of CO₂ in the initial mixture = 600 ml

Volume of CO in the initial mixture = (1000 - 600)

= 400 ml