Chemistry

Chemistry of Gases and Applications

1,175 Questions

The chemistry of gases covers atmospheric composition, noble gases, and various applications of gas compounds in industrial and biological processes. Understanding the properties of common gases, their reactions, and environmental occurrences is vital for general science sections. Use these questions to practice identifying gases and their specific uses.

Atmospheric gasesNoble gasesGas applicationsChemical compounds

Chemistry of Gases and Applications Questions

Multiple choice

Which gas in the atmosphere helps in burning?

  1. Nitrogen

  2. Carbon dioxide

  3. Oxygen

  4. Argon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen is the gas in air that supports combustion (burning). Burning is essentially rapid oxidation - fuel combines with oxygen releasing heat and light. Without oxygen, combustion cannot occur. Nitrogen actually suppresses combustion.

Multiple choice

Which one of the following gases is an end product of burning?

  1. Oxygen

  2. Carbon dioxide

  3. Vapours

  4. Argon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide (CO2) is the primary end product of complete combustion. When fuel burns completely in the presence of oxygen, carbon in the fuel combines with oxygen to form CO2. Incomplete combustion produces carbon monoxide or soot instead. Oxygen is consumed during burning, not produced.

Multiple choice

Animals inhale _______ gas; while exhale ________ gas.

  1. Nitrogen/Oxygen

  2. Carbondioxide/Oxygen

  3. Oxygen / Carbon dioxide

  4. Argon / Nitrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Animals take in oxygen for cellular respiration and release carbon dioxide as a waste product. This gas exchange is fundamental to aerobic respiration in all animals.

Multiple choice

Which one of the following gas is not a constituent of air?

  1. Sulphur dioxide

  2. Nitrogen

  3. Oxygen

  4. Carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sulphur dioxide is not a natural component of clean air - it's a pollutant produced by burning fossil fuels and volcanic activity. The main constituents of air are nitrogen, oxygen, argon, and carbon dioxide.

Multiple choice

___________ and _________ are the major components of air?

  1. Water vapour and Carbon dioxide

  2. Argon and Nitrogen

  3. Nitrogen and Oxygen

  4. Xenon and Helium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Together, nitrogen and oxygen constitute about 99% of Earth's atmosphere. Nitrogen comprises roughly 78% and oxygen about 21%.

Multiple choice

_____________ is not ideally a constituent of air.

  1. Oxygen

  2. Nitrogen

  3. Carbon monoxide

  4. Water vapour

  5. Carbon dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. Carbon monoxide (CO) is a colourless, odourless and tasteless gas that is slightly less dense than air. It is toxic to humans and animals. 

Multiple choice

Nitrogen is one of the useful gases. Which of the following statements is not a correct?

  1. Nitrogen is used in slowing down the process of combustion.

  2. It dilutes the concentration of oxygen.

  3. Nitrogen is used in the manufacture of ammonia.

  4. Aquatic plants use dissolved nitrogen for respiration.

  5. Nitrogen is required in plants and is part of chlorophyll pigment.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as this statement is not correct. Fishes and aquatic plants do not use dissolved nitrogen for breathing and respiration. Dissolved oxygen is used by fishes and aquatic plants for breathing.

Multiple choice

Match the following.

a. Nitrogen 1. Mixture of gases
b. Carbon dioxide 2. Major part of air
c. Air 3. Burning of fuels
d.Pollution 4. Used by plants to make food

  1. a - 1, b - 2, c - 3, d - 4

  2. a - 4, b - 3, c - 2, d - 1

  3. a - 2, b - 4, c - 1, d - 3

  4. a - 2, b - 4, c - 3, d - 1

  5. a - 4, b - 2, c - 1, d - 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. Nitrogen constitutes a major part of air, carbon dioxide is used by plants to make food, air is a mixture of gases and pollution is caused by burning of fuels.

Multiple choice

Gas liberated in Bhopal gas tragedy was�

  1. Methyl isocynate

  2. Phenyl isocynate

  3. Ethylene

  4. Acetylene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The 1984 Bhopal disaster involved a leak of methyl isocyanate (MIC) gas from a Union Carbide pesticide plant, causing thousands of deaths and long-term health effects in the surrounding population.

Multiple choice

Comets are made up of frozen gases like water, ammonia, _____and carbon dioxide.

  1. propane

  2. ethane

  3. butane

  4. methane
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Comets are icy bodies composed of frozen volatiles including water, ammonia, methane, and carbon dioxide. Methane (CH4) is the correct answer - it's a simple hydrocarbon found frozen in cometary nuclei alongside water ice. Propane, ethane, and butane are larger hydrocarbons not typically found as primary components of comets.

Multiple choice

Balloons are filled with

  1. helium

  2. oxygen

  3. nitrogen

  4. argon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Helium is used to fill balloons because it's lighter than air and non-flammable, unlike hydrogen which is also light but extremely dangerous. Helium is a noble gas that doesn't react with other substances. Being the second lightest element after hydrogen, it provides the lift needed for balloons and airships while remaining completely safe.