Chemistry Gaseous State ( Not In Syllabus ) Ideal Gas Equation and Related Gas laws Single Correct MCQ
Published on: August 13, 2026

A container holds 22.4 litre of a gas at 1 atmospheric pressure and at 0ºC. The gas consists of a mixture of argon, oxygen and sulphur dioxide in which :

A
Partial pressure of SO 2 = (Partial pressure O 2 ) + (Partial pressure of Ar)
B
Partial pressure of O 2 = 2 × partial pressure of Ar Calculate the density of the gas mixture under these conditions.

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The correct answer is:
B

(2.201 g/L)

Let moles of Ar = x

Moles of O 2 = y

Moles of SO 2 = 1 – (x + y)

Total moles of mixture =

1 – (x + y) = y + x ⇒ 1 = 2 x + 2y

y = 2 × x 1 = 2x + 4x

x =

y =

M mix = = 49.33

f = = = 2.2 g/L

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