Chemistry MCQs

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Propanol belongs to Alcohol group. Alcohols are suffixed with ‘ol’ and have a functional group OH attached to them. For example: Butanol, Propanol etc.

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The monomer unit of PMMA is methyl methacrylate. It is a hard and transparent polymer and quite resistant to the effect of heat, light and ageing. It has high optical clarity.

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Terelene is a polymer obtained by the condensation reaction between ethylene glycol and terephthalic acid. It is widely used in making wash and wear fabrics as it has low absorbing power.

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A polymer formed from only one kind of monomers is called homopolymer. Polyethene –(– CH2– CH2 –)–n is an example of homopolymer.

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The permanent hardness in water is due to the presence of calcium sulphate/calcium chloride and/or magnesium sulphate/magnesium chloride in water.

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Hard water contains calcium and magnesium ions. These ions form insoluble calcium and magnesium soaps respectively when sodium or potassium soaps are dissolved in hard water. These insoluble soaps separate as scum in water and are useless as cleansing agent.

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Argon’s elemental symbol is Ar, and it is the most abundant noble gas in the atmosphere. There’s so much Ar in the atmosphere because most of it was produced by a long-lived radioactive isotope of potassium in the earth’s crust and released over geologic time.

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Chloroxylenol, also known as para-chloro-meta-xylenol, is an antiseptic and disinfectant which is used for skin disinfection and cleaning surgical instruments. It is also used within a number of household disinfectants and wound cleaners.

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In addition to glucose and fructose, several other sugars are present in small amounts in grapes. Grapes that are over ripe, such as some late harvest wines, may have more fructose than glucose.

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Nickel allergy is a common cause of allergic contact dermatitis — an itchy rash that appears where your skin touches a usually harmless substance. Nickel allergy is often associated with earrings and other jewelry. But nickel can be found in many everyday items, such as coins, zippers, cellphones and eyeglass frames.