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

Aqua regia is

  1. nitrous oxide and water

  2. sulphuric acid and water

  3. nitric acid and water

  4. ammonia and water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ans : 3.

Multiple choice

Pure ozone gas is

  1. dark blue

  2. pale blue

  3. voilet black

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

Ans : 2.

Multiple choice

The lightest substance known is

  1. air

  2. hydrogen

  3. helium

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

Hydrogen is the lightest known substance, with an atomic mass of approximately 1 atomic mass unit (amu). It's the first element in the periodic table and the most abundant element in the universe. Under standard conditions, hydrogen exists as a diatomic gas (H₂) and is about 14 times lighter than air. Helium is the second lightest element, while air is a mixture of gases and oxygen is much heavier.

Multiple choice

The gas predominantly responsible for the yellowing of the Taj is

  1. sulphur dioxide

  2. carbon dioxide

  3. both 1 and 2

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sulphur dioxide (SO2) is the primary pollutant responsible for the yellowing of the Taj Mahal's white marble. This gas is emitted from nearby industries and refineries, particularly the Mathura refinery. When SO2 reacts with moisture in the atmosphere, it forms sulphuric acid, which deposits on the marble surface and causes yellowing and corrosion over time.

Multiple choice

Balloons are filled with _________.

  1. oxygen

  2. hydrogen

  3. nitrogen

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydrogen gas is the lightest gas and was historically used to fill balloons because it provides good lift. However, hydrogen is highly flammable, which is why modern balloons typically use helium instead. Among the given options, hydrogen is the correct answer for traditional balloon-filling gas.

Multiple choice

Which of the following gases is called laughing gas?

  1. Nitrous oxide

  2. Sodium chloride

  3. Sodium carbonate

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

This is called nitrous oxide, which is used as an anesthetic. This disease is caused by polluted air so it is not an epidemic disease.�

Multiple choice

Ethane on oxidation yields

  1. carbon dioxide and water

  2. carbon monoxide

  3. carbon monoxide and water

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

Ans : 1.

Multiple choice

Air is a________.

  1. gas

  2. atmosphere

  3. mixture of gas

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Air is a homogeneous mixture of several gases, primarily nitrogen (about 78%), oxygen (about 21%), and small amounts of argon, carbon dioxide, and other gases. It is not a pure substance or just 'gas'.

Multiple choice

Which one of the following gases contains the maximum % of carbon monoxide?

  1. Coal gas

  2. Natural gas

  3. Producer gas

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

Coal gas contains the highest percentage of carbon monoxide (about 25-35%) among the options. Producer gas and water gas also contain CO but in different proportions. Natural gas is primarily methane and contains minimal carbon monoxide.