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 occupies 22.4 litres at N.T.P.?

  1. 17 gm NH3

  2. 22 gm CO2

  3. 1.7 gm NH3

  4. 4.4 gm CO2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At N.T.P., one mole of any gas occupies 22.4 litres. The molar mass of NH3 is 14 + 3 = 17 grams. Therefore, 17 grams of NH3 is one mole and occupies 22.4 litres.

Multiple choice

Which of the following is not noble gas?

  1. Krypton

  2. Xenon

  3. Radon

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

Sodium is an alkali metal, not a noble gas. Noble gases are found in Group 18 of the periodic table, while sodium is in Group 1.

Multiple choice

Air is a/ an

  1. element

  2. compound

  3. mixture

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

Air is a mixture because it consists of various gases like nitrogen, oxygen, and argon that are physically combined, not chemically bonded in a fixed ratio.

Multiple choice

Which among the following is the average composition of dry air?

  1. N2 = 55%, O2 = 40%, Argon = 1%, CO2 = 3% and other gases = 1%

  2. N2 = 85%, O2 = 12 %, Argon = 2%, CO2 = 0.5% and other gases = 0.5%

  3. N2 = 75%, O2 = 20.95 %, Argon = 0.93%, CO2 = 0.03% and other gases = 0.01%

  4. N2 = 73%, O2 = 19.75%, Argon = 2.4%, CO2 = 0.09% and other gases = 1.52%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The average composition of dry air is N2 = 75%, O2 = 20.95%, Argon = 0.93%, CO2 = 0.03% and other gases = 0.01%.

Multiple choice

Which of the following could replace 'drive out' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option according to the corresponding number in the passage.

All life forms need (1) air and water. They are very important for living things. We can feel air all around us, but we cannot see or hold it. That's becoze (2) air is made up of gases. Gases are stuff (3) like steam, but they are so light that you cannot see or touch them. Some gases mixed in air are very important for life. We also find them in water when air mixes (4) with water. That happens whenever air touches water. Living things get these gases by taking in (5) either air or water. They drive out (6) harmful gases and things from their bodies with the air or water they pass out. The air and water flowing (7) in and out of living things keep the clock of life (8) ticking inside them.

  1. drink

  2. eject

  3. expel

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

'Driving out' is a forceful action and the only word that matches this description is 'expel'.