Chemistry Quiz 6

Photo-oxidation process is initiated by light. The meaning of Photo-oxidation is oxidation under the influence of radiant energy (such as light). It is the degradation of a polymer surface due to the combined action of light and oxygen. It is the most significant factor in the weathering of plastics.

The fuel used in an atomic reactor is Uranium. Uranium is the most widely used fuel by nuclear power plants for nuclear fission.

Radioactive disintegration of uranium ultimately results in formation of lead. The half-life of uranium-238 is 4.5 billion years. It decays into radium-226, which in turn decays into radon-222. Radon-222 becomes polonium-210, which finally decays into a stable nuclide, lead.

Dry powder fire extinguishers contain sand and sodium bicarbonate. It sprays a very fine powder of sand and sodium bicarbonate (NaHCO₃, baking soda) or potassium bicarbonate (KHCO₃) or monoammonium phosphate ((NH₄)H₂PO₄).

Silver bromide (AgBr) is used for making a film for photography. It is used in photography as a component of an emulsion that helps develop a photographic image. Silver bromide is sensitive to light, and when suspended in gelatin, silver bromide's grains create a photographic emulsion. When exposed to light, silver bromide decomposes and as a result, it preserves a photographic image.

The reduction of a metal oxide to form metal by using aluminium powder as a reducing agent is called a thermite reaction. It is an exothermic reaction in which a large amount of heat is evolved. This reduction property of aluminium is used in welding broken pieces of iron rails and machine parts.

Graphite is used in pencil lead because it is soft and leaves an impression on the paper and cleans easily between the layers. It has layered structure layers are held by van der Waal forces.

The indicator used in the titration of sodium carbonate with sulphuric acid is Methyl orange. Methyl orange is a pH indicator frequently used in titration because of its clear and distinct colour variance at different pH values. Methyl orange shows red colour in the acidic medium and yellow colour in the basic medium.

The metal, which is a constituent of vitamin B₁₂ is Cobalt. Cyanocobalamin (commonly known as Vitamin B₁₂) is a highly complex, essential vitamin, owing its name to the fact that it contains the mineral, cobalt.

Electroplating is the process of coating a metal with a thin layer of another metal by electrolysis to improve the metal's corrosion resistance. The metals commonly used for electroplating are nickel, chromium, cadmium, copper, gold, palladium, platinum, ruthenium, silver, tin and zinc.