Chemistry of Gases and Applications

Argon is a noble gas with a complete outer electron shell, making it chemically inactive and unreactive under normal conditions. It constitutes about 0.93% of Earth's atmosphere. Nitrogen is relatively inert but can form compounds; oxygen is highly reactive. Argon's inertness makes it useful in welding and light bulbs.

The pure and effective chemical, Toluene, is also known as methyl benzene. This aromatic hydrocarbon is widely used as a solvent and an industrial feedstock. Due to its intoxicating attributes, it is widely used as inhalant drug such as other solvents. Toluene is a clear water-insoluble liquid that smells like paint thinners.

Citric Acid is widely known for its toxic elements and accurate composition. This anhydrous acts as a natural preservative, which is used to enhance sour or acidic taste in soft drinks and foods. Moreover, due to its varied properties, this acid is extensively used as an environmentally benign cleaning agent.

Chlorosulfuric acid is the inorganic compound with the formula HSO₃Cl. It is also known as chlorosulfonic acid. It is a distillable, colourless liquid .It is a hygroscopic and a powerful lachrymator.

Noise is defined as unwanted energy from sources other than the transmitter.

This option is correct because Acrolein, glycerol and acrylonitrile are derived from propylene.

This option is correct because isooctane has highest octane number and n-hexadecane has highest cetane number.

Hydrogen is the lightest gas and was historically used in balloons because it provides excellent lift. However, helium is now preferred for safety reasons since hydrogen is highly flammable (as seen in the Hindenburg disaster). The question reflects older practice but the answer is historically accurate.

Gobar gas is produced by anaerobic digestion of organic matter, primarily producing methane (50-75%) along with CO2. Methane is the main combustible component that makes biogas useful as fuel.

Urea (CO(NH2)2) is a nitrogen-containing compound produced in the liver as a waste product of protein metabolism. It is the primary source of nitrogen excretion in mammals and contains approximately 46.7% nitrogen by mass.

Yes, it is the correct answer. 

Tear gas is commonly used by law enforcement for crowd control during riots. Laughing gas (nitrous oxide) is used as an anesthetic, neon gas is in lighting, and marsh gas (methane) occurs naturally in swamps.

National highway signboards in India are made of retro-reflective sheeting materials that reflect light back to its source, making them visible at night. They are not made of gases like neon, hydrogen, or freon, making 'none of these' the correct answer.

Mustard gas is a poisonous chemical warfare agent that causes severe burns and respiratory damage. Hydrogen and oxygen are essential elements for life, while carbon dioxide is a natural byproduct of respiration that is not poisonous at normal concentrations.

Helium is classified as an inert gas (also known as a noble gas). Noble gases are characterized by having complete valence electron shells, making them extremely stable and unreactive under normal conditions. Tear gas is used for riot control, laughing gas is nitrous oxide (N2O), so these are incorrect.