Following reaction takes places in tube,
C+CO2→2CO
The volumes are measured under the same conditions. They must be in the whole number ratio accroding to Dalton's law
Volume of mixture of CO and CO2 = 1L
Let volume of CO2 in mixture = x
Volume of CO formed from the reaction = 2 x
Volume of CO before the reaction = 1 – x
After the reaction , the mixture does not contain CO2
Total volume of CO after reaction =(1–x)+2x=1+x=1.6
x = 0.6 L