10 litres of `O_(2)` gas is reacted with 30 litres of CO at S.T.P. The volumes of each gas present at the end of the reaction are

Options

A. 10 L `CO_2,` 10 L CO
B. 20 L `CO_2,` 20 L CO
C. 10 L `CO_2,` 20 L CO
D. 20 L `CO_2,` 10 L CO

Answer

D

Explanation

`{:(2CO,+,O_2,to,2CO_2),(2"vol",,1"vol",,"2vol"):}`
1 vol `O_2` reacts with 2 vol CO
10 L `O_2` reacts with 20 L CO
CO left after reaction = 30 - 20 = 10 L
10 L `O_2` produces 20 L `CO_2`
Hence, after the reaction, CO = 10 L, `CO_2` = 20 L