Chemistry Quiz 3

Carbon monoxide (CO) is the major harmful gas emitted by automobile vehicles which causes air pollution. It results from incomplete combustion of fuel and is emitted directly from vehicle tailpipes.

Superphosphate is not a nitrogenous fertilizer. The nitrogenous fertilizer industry includes the production of synthetic ammonia, nitric acid, ammonium nitrate, ammonium sulphate and urea.

Silver halides are used in photographic plates because they are reduced by light. Silver halides are photosensitive as they react with light to form the image. A silver halide is a compound of silver and a halogen; for example, silver bromide (AgBr), silver chloride (AgCl), silver fluoride (AgF), and silver iodide (AgI).

Freon is a non-combustible gas that is used as a refrigerant in air conditioning applications. It is Dichlorodifluoromethane (CCl₂F₂). Dichlorodifluoromethane is a colourless gas usually sold under the brand name Freon-12.

Rocket engines and boosters carry both fuel and an oxidizer. For solid fuel, the components are aluminium and ammonium perchlorate. For liquid fuel, the components are liquid hydrogen and liquid oxygen. When combined, the fuels release water, which allows the rocket to leave the ground.

Transboundary pollution is the pollution that originates in one country but is able to cause damage to another country's environment, by crossing borders through pathways like water or air. It is caused by a chemical reaction that begins when compounds like sulphur dioxide (SO₂) and nitrogen oxides (NO_x) are released into the air. Acid rain is an example of Transboundary pollution.

Acid rain is caused by a chemical reaction that begins when compounds like sulphur dioxide (SO₂) and nitrogen oxides (NO_x) are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. Nitrogen oxide (NO) and nitrogen dioxide (NO₂) are collectively known as nitrogen oxides (NO_x).

The gas that is used in the manufacture of vanaspati ghee is hydrogen. Hydrogenation is a process where manufacturers add hydrogen to a liquid fat, such as vegetable oil, to turn it into a solid fat at room temperature.

The mixture of Propane (C₃H₈) and Butane (C₄H₁₀) gases is mainly stored as a liquid under pressure in LPG cylinder.

The atomic clock is based on transitions in Caesium. The caesium atomic clock is the most accurate type of clock yet developed. This device makes use of transitions between the spin states of the cesium nucleus and produces a frequency which is so regular that it has been adopted for establishing the time standard.