Chemistry

Chemistry of Gases and Applications

1,190 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 is the gas best suitable for extinguishing the fire involving electrical equipments and inflammable materials like petrol?

  1. (O2) oxygen

  2. Nitrogen

  3. Carbon dioxide

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

Carbon dioxide is the best extinguishing agent for electrical fires and flammable liquid fires like petrol because: (1) It is non-conductive, so it won't cause electric shocks, (2) It is heavier than air and forms a blanket over the fire, cutting off oxygen supply, and (3) It doesn't leave residue or damage electronic equipment. Oxygen would fuel the fire, nitrogen is less effective, and hydrogen is highly flammable.

Multiple choice

Nitrogen gas can be prepared by heating a mixture of

  1. sodium nitrite and ammonium chloride

  2. ammonium nitrate and sodium chloride

  3. sodium nitrate and sodium chloride

  4. ammonium chloride and sodium chloride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrogen gas can be prepared by heating a mixture of sodium nitrite and ammonium chloride.

Multiple choice

Substances burn more rapidly in pure oxygen than in air because

  1. air contains helium

  2. air has a lower concentration of oxygen than pure oxygen

  3. air contains methane

  4. air contains ozone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Substances burn more rapidly in pure oxygen than in air because air has a lower concentration of oxygen than pure oxygen.

Multiple choice

Which of the following gases is present in an air conditioner?

  1. Neon

  2. Freon

  3. Methane

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

Freon is a chlorofluorocarbon (CFC-113). In addition to being used in air conditioning systems, it is also used as refrigerant in refrigerators and freezers and also in firefighting systems, and as an aerosol propellant.

Multiple choice

Consider the following statements:

  1. Stainless steel pans are usually provided with copper bottoms because copper is easier to clean than the stainless steel.
  2. The process of conversion of water into vapours without reaching the boiling point is called evaporation.

Which of the given statements is/are incorrect?

  1. Only (1)

  2. Only (2)

  3. Both (1) and (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement (1) is incorrect. Stainless steel pans are usually provided with copper bottoms because copper is a better conductor of heat than the stainless steel. Statement (2) is correct. The process of conversion of water into vapours without reaching the boiling point is called evaporation.

Multiple choice

LPG is a mixture of

  1. methane and hydrogen

  2. ethane and carbon monoxide

  3. ethane and propane

  4. butane and propane

  5. pentane, butane, propane and ethane

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

LPG is a mixture of 60% propane and 40% butane for commercial uses. The higher grade propane mix is approximately 90% propane and 10% butane.