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 of the following produces acetylene gas on hydrolysis?

  1. Be2C

  2. Al4C3

  3. CaC2

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Calcium carbide (CaC₂) reacts with water to produce acetylene gas (C₂H₂) and calcium hydroxide: CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂. Beryllium carbide (Be₂C) and aluminum carbide (Al₄C₃) produce methane (CH₄), not acetylene, when hydrolyzed. Therefore 'All of these' is incorrect.

Multiple choice

Which of the following statements is/are false?

a. Naphthalene balls disappear with time without leaving any residue because they undergo sublimation. b. Ammonia gas can be liquified by applying high pressure and lowering the temperature. c. Dry ice sublimes to form carbon monoxide gas.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. Dry ice sublimes to form carbon dioxide gas.

Multiple choice

Which of the following is the gas used for refrigeration?

  1. Nitrogen

  2. Oxygen

  3. Ammonia

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

Ammonia (NH3) is one of the oldest and most widely used refrigerants due to its excellent thermodynamic properties and zero ozone depletion potential. It has high latent heat of vaporization, making it very efficient for heat absorption. Nitrogen and oxygen are not used as refrigerants in standard refrigeration systems, and chlorine is toxic and corrosive.

Multiple choice

Which of the following gases is used in the artificial ripening of green fruits?

  1. Acetylene

  2. Ethane

  3. Hydrogen

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

Acetylene (C2H2) is widely used in artificial fruit ripening, especially in developing countries. Calcium carbide (CaC2) reacts with moisture to release acetylene, which mimics ethylene's natural ripening action. Ethane and hydrogen don't trigger ripening; CO2 is sometimes used in controlled atmosphere storage but not for ripening.

Multiple choice

Chloro-fluro-carbon gases are not used in which of the following?

  1. Aerosol sprays

  2. Fire-extinguishers

  3. Refrigerators

  4. Air-conditioning
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

CFCs (Chlorofluorocarbons) were widely used in aerosol sprays, refrigerators, and air conditioning systems as refrigerants and propellants. However, they were never used in fire extinguishers - fire extinguishers use different agents like carbon dioxide, dry chemicals, foam, or halons (which are related but distinct from CFCs and were also phased out for environmental reasons).

Multiple choice

Natural gas is used in the production of fertilisers because

  1. it supplies hydrogen gas used in the process

  2. it supplies nitrogen gas used in the process

  3. it supplies ammonia

  4. it supplies oxygen

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct. Natural gas supplies hydrogen and nitrogen is supplied by the air for the process used to make fertilisers.

Multiple choice

Consider the following statements:

  1. Acetylene a non-toxic gas helps in formation of enzymes which ripen fruits.
  2. The shape of a rain drop is determined by force of attraction between the water molecules.
  3. Methyl isocyanite was released during Bhopal gas tragedy.

Which of the given statements is/are correct?

  1. Only (1)

  2. Only (2)

  3. Only (1) & (3)

  4. Only (2) & (3)

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (1) is correct. Acetylene or Ethylene gas is used in developing the enzymes for the ripening of fruits and vegetables.

Statement (2) is incorrect. The shape of a rain drop is determined by surface tension. Statement (3) is correct.  Bhopal gas Tragedy in 1984 was caused due to leakage of methyl isocyanite.
Multiple choice

Which gas is present under pressure in soft drinks?

  1. oxygen

  2. nitrogen

  3. carbon dioxide

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

Carbon dioxide is dissolved under pressure in soft drinks to create carbonation. When the bottle is opened, pressure decreases and CO2 comes out of solution as bubbles, creating the characteristic fizz. This is why soft drinks are called 'carbonated beverages' - they contain dissolved CO2 gas.