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

What is the gas present in fluorescent lamps?

  1. Sodium vapour

  2. Neon

  3. Mercury vapour

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

Fluorescent lamps contain a small amount of mercury vapor. When electricity is passed through the lamp, the mercury atoms emit ultraviolet light, which is then converted to visible light by the phosphor coating.

Multiple choice

Air supplies _______ and ______to crops and living beings.

  1. carbon and hydrogen

  2. <span style="font-family:" arial;="" font-size:="" small;="">carbon<span style="font-family:" arial;="" font-size:="" small;=""> and oxygen

  3. hydrogen and oxygen

  4. carbon, hydrogen and oxygen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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Multiple choice

Dry Ice is chemically known as

  1. carbon dioxide

  2. carbon monoxide

  3. sulphur dioxide

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

Dry ice is the solid form of carbon dioxide. It is used primarily as a cooling agent.

Multiple choice

Laughing gas is

  1. NO

  2. N2O3

  3. N2O

  4. N2O5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

N2O is also known as laughing gas.

Multiple choice

Which of the following is not a type of laser?

  1. Hydrogen laser

  2. CO2 laser

  3. Neon laser

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

The hydrogen fluoride laser is an infrared chemical laser. It is capable of delivering continuous output power in the megawatt range.

Multiple choice

Inhaled air contains

  1. oxygen

  2. carbon dioxide

  3. mixture of CO2 oxygen,

  4. mixture of CO2, nitrogen, oxygen

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice

In refrigerators, the liquid used as refrigerant is

  1. liquid carbon dioxide

  2. liquid nitrogen

  3. liquid ammonia

  4. super-cooled water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ammonia is commonly used as a refrigerant in industrial and commercial refrigeration systems due to its thermodynamic properties.

Multiple choice

For respiration, deep-sea divers use a mixture of

  1. oxygen and helium

  2. oxygen and carbon dioxide

  3. oxygen and hydrogen

  4. oxygen and nitrogen/helium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To breathe underwater a diver must be supplied air at a pressure equal to that of the water surrounding the diver. Air of course is a suitable breathing mixture for a diver based primarily on nitrogen as the oxygen diluent. Beyond this depth helium is preferred as the diluent and is in fact particularly well suited to the depth. Helium does not cause narcosis at these pressures, is relatively inexpensive and is readily available.

Multiple choice

Which of the following substances is a compound?

  1. Charcoal

  2. Potassium permanganate

  3. Vinegar

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

Potassium permanganate (KMnO4) is a chemical compound. Charcoal is primarily carbon (an element), while vinegar and syrup are mixtures.

Multiple choice

Cooking gas is a mixture of

  1. methane and carbon dioxide

  2. oxygen and nitrogen

  3. butane and propane

  4. butane and methane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Liquefied Petroleum Gas (LPG), commonly used for cooking, is primarily a mixture of propane and butane.