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#6585. The sum of two angles of a triangle is 116 degrees and their difference is 24 degrees. Find the measure of the smallest angle of the triangle.

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M # 326. A hollow sphere of internal and external diameters 4 centimeters and 8 centimeters respectively is melted into a cone of base diameter 8 centimeters. Find the height of the cone.

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#1270. The skull is a bony structure that forms the head in vertebrates. It supports the structures of the face and provides a protective cavity for the brain. The skull is composed of two parts. Name them.

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#6987. Name the longest road tunnel in the world succeeding the Swiss Gotthard Road Tunnel. The tunnel carries two lanes of European Route E16 and represents the final link on the new main highway connecting Oslo and Bergen without ferry connections and difficult mountain crossings during winter.

#6988. Where is the 'San Diego Zoo'?

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#4118. Find the equation of a line whose slope is

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M # 325. The surface area of a cube is 150 square meters. Find the length of its diagonal.

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#4117. If the slope of the line joining the points (-4,a+2) and (1-2a,2) is

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SP#391. Find the sum of the given series:  1 + 3 + 5 + 7 + .... up to 100 terms.

141) Phenol

Phenol, any of a family of organic compounds characterized by a hydroxyl (−OH) group attached to a carbon atom that is part of an aromatic ring. Besides serving as the generic name for the entire family, the term phenol is also the specific name for its simplest member, monohydroxybenzene (C6H5OH), also known as benzenol, or carbolic acid.

Phenols are similar to alcohols but form stronger hydrogen bonds. Thus, they are more soluble in water than are alcohols and have higher boiling points. Phenols occur either as colourless liquids or white solids at room temperature and may be highly toxic and caustic.

Phenols are widely used in household products and as intermediates for industrial synthesis. For example, phenol itself is used (in low concentrations) as a disinfectant in household cleaners and in mouthwash. Phenol may have been the first surgical antiseptic. In 1865 the British surgeon Joseph Lister used phenol as an antiseptic to sterilize his operating field. With phenol used in this manner, the mortality rate from surgical amputations fell from 45 to 15 percent in Lister’s ward. Phenol is quite toxic, however, and concentrated solutions cause severe but painless burns of the skin and mucous membranes. Less-toxic phenols, such as n-hexylresorcinol, have supplanted phenol itself in cough drops and other antiseptic applications. Butylated hydroxytoluene (BHT) has a much lower toxicity and is a common antioxidant in foods.

In industry, phenol is used as a starting material to make plastics, explosives such as picric acid, and drugs such as aspirin. The common phenol hydroquinone is the component of photographic developer that reduces exposed silver bromide crystals to black metallic silver. Other substituted phenols are used in the dye industry to make intensely coloured azo dyes. Mixtures of phenols (especially the cresols) are used as components in wood preservatives such as creosote.

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#6985. Name the Russian research station in inland Princess Elizabeth Land, Antarctica. Founded by the Soviet Union in 1957, the station lies at the southern Pole of Cold, with the lowest reliably measured natural temperature on Earth of −89.2 °C (−128.6 °F; 184.0 K).

#6986. In which country/continent is 'Iquique' situated? (One of the driest places in the World).

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#4116. Find the slope of the line joining the points (-3,8) and (4,-2).

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SP#390. Find the sum of the series : 2 + 6 + 18 + .... + 4374.