Question

Four ten litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same temperature and pressure. The ratio of the total number of atoms of these gases present in different flasks would be?

• A. $1:2:3:2$
• B. $2:1:2:3$
• C. $1:3:2:2$
• D. $1:1:1:1$

Answer 1

The correct option is B $2:1:2:3$

Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.

The ratio of the gases $H_2:He:O_2:O_3$ filled separately in four 10 litre flasks at the same temperature and pressure = 2: 1: 2: 3.

Hence, option $B$ is correct.