Atmospheric composition (GK): What is the major constituent of dry air near sea level by volume? Choose the correct option.

Q: Atmospheric composition (GK): What is the major constituent of dry air near sea level by volume? Choose the correct option.

Concept Dry air near sea level is composed primarily of nitrogen (~78%), then oxygen (~21%), argon (~0.93%), and trace gases including CO₂. Final Answer Nitrogen (~78%)

Difficulty: Easy

Oxygen (~21%)
Nitrogen (~78%)
Carbon dioxide (~0.04%)
Argon (~0.93%)

Correct Answer: Nitrogen (~78%)

Explanation:

Concept
Dry air near sea level is composed primarily of nitrogen (~78%), then oxygen (~21%), argon (~0.93%), and trace gases including CO₂.

Final Answer
Nitrogen (~78%)

← Previous Question Next Question→

More Questions from Chemistry

Gaseous volumes with equal masses: Equal masses of O₂, H₂, and CH₄ are kept under identical conditions of temperature and pressure. What is the ratio of their volumes? Use V ∝ (moles) ∝ (mass/molar mass) at same T and P. Choose the correct option.
History of materials: Identify the first metal widely used by humans in antiquity for tools and ornaments. Consider native occurrence and early metallurgy. Choose the correct option.
Periodic trends (electronegativity): Which element listed is the most electronegative? Use the Pauling scale trend across periods and up groups. Choose the correct option.
Molar mass concept: The mass of one Avogadro number of helium atoms (i.e., one mole of He) equals what value? Recall molar mass equals atomic weight in grams per mole. Choose the correct option.
Indian R&D institutions (GK): Where is the National Chemical Laboratory (NCL) located in India? Choose the correct option.
Ionic size (isoelectronic series): Arrange the ionic radii of N³⁻, O²⁻, F⁻, and Na⁺ in the correct order. All have 10 electrons; size depends on nuclear charge Z. Choose the correct option.
Polymers (monomer identification): What is the monomer used to make polythene (polyethylene)? Give the correct simple alkene monomer. Choose the correct option.
Mineral processing: The ore-concentration method that exploits density differences between ore and gangue is called what? Think of gravity-based separation methods. Choose the correct option.
Post-harvest biology: Which gas is used commercially to induce/artificially ripen green fruits? Select the natural plant hormone gas used for ripening. Choose the correct option.
Periodic trends (electropositivity): Which of the following is the most electropositive element? Recall: metallic character increases down a group and to the left. Choose the correct option.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion