Chemistry of Gases and Applications

Dry ice is the solid form of carbon dioxide. It is produced by compressing and cooling gaseous carbon dioxide until it undergoes a phase change into a solid.

Nitrogen makes up about 78 percent of the Earth's atmosphere and is relatively inert. Its presence dilutes oxygen, which prevents combustion from occurring too rapidly or uncontrollably.

Carbon dioxide is denser than air and does not support combustion, making it effective for extinguishing fires.

The Earth's atmosphere is composed of approximately 78 percent nitrogen, 21 percent oxygen, and about 0.93 percent argon. Argon is the third most abundant gas.

Nitrogen is produced in the laboratory by heating ammonium chloride (NH4Cl) with sodium nitrite (NaNO2), producing NaCl, N2, and H2O. This is a standard nitrogen preparation method. Option B has a typo (nitrarte), and options C and D don't produce nitrogen gas.

Carbon dioxide is highly soluble in water, especially under pressure, forming carbonic acid. Oxygen and nitrogen have much lower solubility in water.

Hydrogen is the lightest element in the periodic table, with an atomic mass of approximately 1.008. Because it exists as a diatomic gas (H2), it remains the lightest gas compared to nitrogen or ammonia.

Fluorescent lamps contain a small amount of mercury vapor. When electricity is passed through the lamp, the mercury atoms emit ultraviolet light, which is then converted to visible light by the phosphor coating.

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Dry ice is the solid form of carbon dioxide. It is used primarily as a cooling agent.

Methane is a highly flammable gas often found in coal mines. When mixed with air, it can form an explosive mixture that ignites easily.

N₂O is also known as laughing gas.

The hydrogen fluoride laser is an infrared chemical laser. It is capable of delivering continuous output power in the megawatt range.

Combustion is a chemical reaction that requires an oxidizer, and oxygen is the primary gas in the atmosphere that supports burning.