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
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Carbon dioxide
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Sulphur dioxide
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Hydrogen sulphide
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None of these
C
Correct answer
Explanation
Hydrogen sulphide gas has smell like rotton egg.
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Bio gas
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Laughing gas
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LPG
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Chalk
B
Correct answer
Explanation
Nitrous oxide (N2O) is commonly known as laughing gas due to its euphoric effects when inhaled. It is frequently used in dentistry and surgery for anesthesia.
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Oxygen
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Hydrogen
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Methane
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Ethane
C
Correct answer
Explanation
Gobar gas, or biogas, is produced through the anaerobic digestion of organic matter, primarily cow dung. Its main combustible component is methane.
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Oxygen
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Water vapour
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Carbon dioxide
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Nitrogen
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ammonia only
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urea only
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uric acid only
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both 'a' and 'c'
A
Correct answer
Explanation
The main nitrogenous waste of Hydra is ammonia. Hydra has no organ of excretion, therefore, excretion of waste nitrogenous matter occurs directly by diffusion through cell membrane.
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Methane
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Hydrogen
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Ammonia
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Oxygen
D
Correct answer
Explanation
Primitive atmosphere chiefly consisting of methane, ammonia, water vapour, hydrogen gas and was reducing. Oxygen was absent in primitive atmosphere. Oxygen came as a result of photosynthesis in green plants.
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17 gm NH3
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22 gm CO2
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1.7 gm NH3
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4.4 gm CO2
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.
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80°C
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85°C
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90°C
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None of these
A
Correct answer
Explanation
Naphthalene is a common organic covalent compound with a melting point of approximately 80 degrees Celsius.
C
Correct answer
Explanation
Radon is a radioactive noble gas that is not typically found in the atmosphere in significant quantities because it has a short half-life and decays quickly.
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Hydrogen
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Oxygen
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Helium
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Nitrogen
C
Correct answer
Explanation
Helium has the lowest boiling point of any known substance, liquefying at approximately 4.2 Kelvin (-268.9 degrees Celsius). Therefore, it turns into liquid at the lowest temperature among the given gases.
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Krypton
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Xenon
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Radon
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Sodium
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.
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Neon
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Argon
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Krypton
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All of the above.
D
Correct answer
Explanation
Neon, Argon, and Krypton are all noble gases, and they all possess a stable octet (eight electrons) in their outermost shell. Therefore, all of the listed options are correct.
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Hydrogen
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Helium
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Oxygen
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Carbon
A
Correct answer
Explanation
The Sun is composed primarily of hydrogen (about 73%) and helium (about 25%), with hydrogen being the most abundant element.
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element
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compound
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mixture
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none of these
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.
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N2 = 55%, O2 = 40%, Argon = 1%, CO2 = 3% and other gases = 1%
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N2 = 85%, O2 = 12 %, Argon = 2%, CO2 = 0.5% and other gases = 0.5%
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N2 = 75%, O2 = 20.95 %, Argon = 0.93%, CO2 = 0.03% and other gases = 0.01%
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N2 = 73%, O2 = 19.75%, Argon = 2.4%, CO2 = 0.09% and other gases = 1.52%
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%.