When 1 dm 3 of CO2 gas is passed over hot coke, the volume of gaseous mixture after complete reaction at STP becomes 1.4 dm 3 . The composition of the gaseous mixture at STP is:

1. A. 0.6 dm 3 of CO , 0.8 dm 3 of CO2
2. B. 0.8 dm 3 of CO , 0.8 dm 3 of CO2
3. C. 0.6 dm 3 of CO , 0.4 dm 3 of CO2
4. D. 0.8 dm 3 of CO , 0.6 dm 3 of CO2

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