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

What is dry ice?

  1. Ice dust

  2. Liquified nitrogen

  3. Liquified H2

  4. Solid CO2

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

Dry Ice is the common name for solid carbon dioxide (CO2). It got this name because it does not melt when heated; instead, it changes directly into a gas (This process is known as sublimation). Due to its extremely low temperature of -78°, dry ice is often used as an alternative to refrigeration of foodstuffs and medical supplies. In addition, special dry ice pellets are used for industrial cleaning.

Multiple choice

Nitrogen gas makes up ____% of our atmosphere.

  1. 78

  2. 21

  3. 0.1

  4. 0.03
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Earth’s relatively thin atmosphere primarily consists of a mixture of nitrogen (78%) and oxygen (21%) gases. The remaining 1% contains several inactive gases (i.e. argon, neon, helium, hydrogen, and xenon) and several other gases that vary in concentration (i.e. water vapour, carbon dioxide, methane, nitrous oxide, ozone, and chlorofluorocarbons).

Multiple choice

Nitroglycerine is active component of _____

  1. Dynamite

  2. Dolomite

  3. Acetic acid

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

Nitroglycerine is the active explosive component in dynamite, which was invented by Alfred Nobel in 1867. Dynamite consists of nitroglycerine absorbed into a porous material like diatomaceous earth. Dolomite is a mineral, while acetic acid and urotropine are chemicals unrelated to explosives.

Multiple choice

What is the full form of CNG?

  1. Compressed natural gas

  2. Compact natural gas

  3. Condensed natural gas

  4. Clear natural gas

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

Yes, it is correct. CNG (Compressed natural gas) (Methane stored at high pressure) can be used in place of gasoline (petrol).

Multiple choice

Which of the following statements is TRUE?

  1. Ozone is a colourless gas.

  2. Elemental sulphur mixed with gangue is called native sulphur.

  3. Monoclinic sulphur is the most stable allotrope of sulphur.

  4. SO2 is basic oxide.

  5. Ozone is stable at room temperature and paramagnetic in nature.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Elemental sulphur mixed with gangue is called native sulphur.

Multiple choice

Which of the following statements is INCORRECT?

  1. NO2 gas is deep brown coloured.

  2. SO2 cannot be collected over water.

  3. NO is lighter than O2.

  4. Red phosphorus is the most stable allotrope of phosphorus.

  5. N2O is known as laughing gas.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Black phosphorus is the most stable allotrope of phosphorus.

Multiple choice

A few chemicals release carbon dioxide gas, by getting decomposed in the heat of the fire, for extinguishing a fire. Which of the following chemicals cannot be used for this purpose?

a. Baking soda b. Potassium bicarbonate c. Citric acid

  1. Only a

  2. Only a and b

  3. Only b

  4. Only 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 cannot be used to extinguish fire. Citric acid will not release carbon dioxide gas, by getting decomposed in the heat of the fire, to extinguish a fire.

Multiple choice

Which of the following gas is evolved if sodium bicarbonate is added to a solution of tartaric acid?

  1. Hydrogen

  2. Nitrogen

  3. Carbon monoxide

  4. Sulphur dioxide

  5. Carbon dioxide

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

Carboxylic acid (organic acid) reacts with NaHCO3/NaCO3 to evolve a CO2 gas. Tartaric acid (OH-CH-COOH )2  is a dicarboxylic acid. It reacts with NaHCO3 to give  CO2 gas and sodium tartrate.

Tartaric acid + sodium bicarbonate → sodium tartrate + carbon dioxide 

 

Multiple choice

Marsh gas mainly contains-

  1. C2H2

  2. H2S

  3. CH4

  4. CH3Cl
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Marsh gas is common name for methane (CH4), formed by anaerobic decomposition of organic matter in marshy areas. Ethyne (C2H2) is a different hydrocarbon, H2S is hydrogen sulfide with rotten egg odor, and CH3Cl is chloromethane.

Multiple choice

Which of the following is the lightest gas?

  1. Nitrogen

  2. Hydrogen

  3. Ammonia

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

Hydrogen (H2) is the lightest gas because it has the lowest molecular mass (2 g/mol) of all gases. All other gases like nitrogen (N2, 28 g/mol), ammonia (NH3, 17 g/mol), and carbon dioxide (CO2, 44 g/mol) are significantly heavier.