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
B
Correct answer
Explanation
Nitrous oxide (N2O) is commonly known as "laughing gas" because it causes euphoria and laughter when inhaled, and has been used as an anesthetic since the 18th century. NO2 is nitrogen dioxide (a toxic gas), NO is nitric oxide, and HN2O is not a valid chemical formula.
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neon
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hydrogen
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chlorine
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krypton
C
Correct answer
Explanation
Chlorine gas (Cl2) has a distinctive greenish-yellow color, which makes it easily identifiable. This is why it was named after the Greek word 'chloros' meaning greenish-yellow. Neon, hydrogen, and krypton are colorless gases.
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helium
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hydrogen
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oxygen
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carbon dioxide
D
Correct answer
Explanation
Carbon dioxide dissolved under pressure creates the fizziness in carbonated drinks like Coke and Pepsi. When the bottle is opened, pressure decreases and CO2 comes out of solution as bubbles. Helium and hydrogen are much lighter gases that would escape, while oxygen doesn't create the characteristic fizz.
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Nitrous oxide
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Hydrogen peroxide
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Sodium monoxide
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Boxite
A
Correct answer
Explanation
Nitrous oxide (N2O) is commonly called 'laughing gas' because inhaling it produces euphoria and laughter. It's used as an anesthetic and analgesic in medical and dental procedures. Hydrogen peroxide is a disinfectant, sodium monoxide is a chemical compound, and 'Boxite' is a misspelling of bauxite (aluminum ore).
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Nitrogen
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Hydrogen
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Oxygen
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Inert gas
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None of these
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Mg(NO2)2
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Mg3(NO2)2
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Mg2(NO2)3
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None of the above
A
Correct answer
Explanation
Magnesium is Mg2+. Nitrite (NO2-) has a -1 charge. Two nitrite ions are needed to balance +2, giving Mg(NO2)2. Mg3(NO2)2 doesn't balance correctly, and Mg2(NO2)3 would be Mg4+.
B
Correct answer
Explanation
The statement claims one gallon of gas can contaminate 750 gallons of water, but this is a significant underestimate. According to environmental agencies like the EPA, one gallon of gasoline can actually contaminate up to 250,000 to 750,000 gallons of water, making it far more damaging than the statement suggests.
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Methyl isocyanite
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Methyl isocyanate
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Methyl isocynide
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None of the above
B
Correct answer
Explanation
The Bhopal gas tragedy was caused by methyl isocyanate (MIC) gas leak from a pesticide plant. 'Methyl isocyanite' and 'Methyl isocynide' are incorrect spellings.
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Hydrogen
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Helium
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Neon
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Krypton
A
Correct answer
Explanation
Jupiter's atmosphere is approximately 90% hydrogen and 10% helium by volume, making hydrogen the primary component. Helium is the second most abundant but much less prevalent. Neon and Krypton are only present in trace amounts.
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ammonium
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hydrocarbons
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oxygen
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nitrogen
A
Correct answer
Explanation
Jupiter's clouds are primarily composed of ammonia (NH3), with ammonia ice crystals forming the upper cloud deck. The atmosphere consists of about 90% hydrogen and 10% helium, with trace amounts of ammonia, water vapor, methane, and other compounds. The ammonia clouds create Jupiter's distinctive banded appearance and colors.
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Reactive
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Inert
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Rare
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Dense
B
Correct answer
Explanation
Noble gases (Group 18 elements) are characterized by their inertness due to having a complete valence shell of electrons. Helium, neon, argon, krypton, xenon, and radon are all very unreactive under normal conditions. 'Inert' means chemically non-reactive, which is the defining property of noble gases.
D
Correct answer
Explanation
Ozone (O3) is a powerful oxidizing agent used in water treatment to kill bacteria, viruses, and other microorganisms. It is more effective than chlorine for some pathogens and leaves no harmful residues. Oxygen (O2) and carbon dioxide (CO2) are not used for purification, and ammonia (NH3) is sometimes used in water treatment but primarily for pH adjustment, not purification.
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Nitrogen
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Oxygen
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Hydrogen
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Methane
A
Correct answer
Explanation
Nitrogen (N2) is the most abundant gas in farts, typically comprising about 59-60% of flatulence volume. This nitrogen comes primarily from swallowed air during eating and drinking. Hydrogen and carbon dioxide are also present in significant amounts, while methane is produced only by some people depending on gut bacteria.
C
Correct answer
Explanation
Hydrogen sulfide (H2S) is the primary gas responsible for the unpleasant odor in farts. Even though it's present in very small concentrations (typically less than 1%), its extremely low odor threshold means we can detect it at parts per billion levels. Nitrogen (N2) is odorless, ozone (O3) is not a normal component of flatulence, and CO2 has no smell.
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carbon monoxide and carbon dioxide
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butane and propane
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methane and ethylene
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carbon dioxide and oxygen
B
Correct answer
Explanation
LPG (liquefied petroleum gas) used for cooking is primarily a mixture of butane and propane. These hydrocarbons are easily liquefied under moderate pressure, making them ideal for storage and transport in gas cylinders. Carbon monoxide and carbon dioxide are combustion products, not components of the fuel itself.