Question

20 cc of $C{O}_2$ gas is passed over red hot coke. The volume of carbon monoxide evolved is:

• A. 10 cc
• B. 20 cc
• C. 30 cc
• D. 40 cc

Answer 1

The correct option is D 40 cc

20 cc of $C{O}_2$ gas is passed over red hot coke. The volume of carbon monoxide evolved is 40 cc.

$C{O}_2\left(g\right)+C\left(s\right)\to 2CO\left(g\right)$

1 mole of $C{O}_2$ gas will form 2 moles of $CO$ gas.

Since volume is proportional to number of moles,

20 cc of $C{O}_2$ gas will form $2\times 20=40$ cc of $CO$ gas.