WAEC Chemistry 2023 Objective — Question 29

Question 29 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

The gas that is less dense than air is

A. carbon (IV) oxide
B. nitrogenCorrect
C. chlorine
D. oxygen

Explanation

For a gas to be less dense than air, its RMM should be less than 28.8 (approx. average molar mass of air). CO2 = 44, N2 = 28, Cl2 = 71, O2 = 32. Only nitrogen is less dense than air here.

Sign up free to unlock

Score tracking
Practice history
Saved questions
Progress dashboard
Personalized sessions
Weak-topic breakdown

…and/or go further with premium services and No Ads.

Create free account

More questions from Chemistry 2023 Objective More Chemistry past papers