Mixed Practice

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Showing 1976 to 2000 of 3046 questions (page 80 of 122).

1976. An electrophile is a species that

A. donates a proton only B. accepts an electron pair C. contains a lone pair always D. donates an electron pair E. is always negatively charged

1977. The order of stability of carbocations is

A. primary greater than secondary greater than tertiary B. all equal C. secondary greater than tertiary greater than primary D. primary greater than tertiary E. tertiary greater than secondary greater than primary

1978. Polythene is obtained from ethene by

A. addition polymerization B. elimination C. condensation polymerization D. substitution E. oxidation

1979. Hydrogenation of vegetable oils to make vanaspati ghee uses a catalyst of

A. vanadium pentoxide B. aluminium chloride C. platinum only D. nickel E. iron

1980. The catalyst used for the chlorination of benzene is

A. platinum B. anhydrous ferric chloride C. sodium hydroxide D. nickel E. vanadium pentoxide

1981. The order of reactivity of alkyl halides towards nucleophilic substitution is

A. R-Br greater than R-F greater than R-I B. R-Cl greater than R-I C. all equal D. R-I greater than R-Br greater than R-Cl greater than R-F E. R-F greater than R-Cl greater than R-Br greater than R-I

1982. Industrial ethanol is produced by the fermentation of

A. fats B. nitrogen compounds C. proteins D. cellulose directly E. sugars by yeast

1983. Denatured alcohol is ethanol that has been made unfit for drinking by adding

A. sugar B. methanol and other additives C. water D. glycerol E. salt

1984. Glycerol is classified as

A. a monohydric alcohol B. an ether C. a phenol D. a trihydric alcohol E. a dihydric alcohol

1985. Diethyl ether was formerly used as

A. a fertilizer B. a fuel additive C. a general anaesthetic D. a preservative for food E. a bleaching agent

1986. Aldehydes and ketones characteristically undergo

A. nucleophilic addition at the carbonyl carbon B. polymerization only C. electrophilic substitution D. free radical substitution E. elimination

1987. Heating a carboxylic acid with ammonia gives, after loss of water,

A. an anhydride B. an amine C. an ester D. an amide E. a nitrile

1988. The general formula of a naturally occurring alpha amino acid is

A. RCH(NH2)COOH B. RCH2CONH2 C. RCOOR D. RCHO E. RCH(OH)COOH

1989. Denaturation of a protein involves

A. addition of amino acids B. hydrogenation C. polymerization D. breaking of peptide bonds E. loss of the three dimensional structure without breaking peptide bonds

1990. Starch gives a characteristic colour with iodine solution that is

A. red B. yellow C. blue black D. colourless E. green

1991. Detergents work better than soaps in hard water because their calcium and magnesium salts are

A. soluble B. volatile C. acidic D. insoluble E. coloured

1992. Urea is manufactured by reacting ammonia with

A. nitrogen B. sulphur dioxide C. carbon dioxide D. carbon monoxide E. water

1993. Eutrophication of a lake is caused mainly by

A. low temperature B. excess chlorine C. acid rain alone D. excess nutrients such as nitrates and phosphates E. high dissolved oxygen

1994. Dissolved oxygen in a river falls when organic pollution rises because

A. the temperature falls B. the pollutant displaces the oxygen physically C. the water becomes acidic D. oxygen reacts with the pollutant directly only E. micro-organisms consume oxygen while decomposing the organic matter

1995. Infrared spectroscopy is used chiefly to identify

A. optical activity B. functional groups C. molar mass D. crystal structure E. isotopes

1996. An error that occurs in the same direction in every reading and does not average out is called

A. a personal error only B. a rounding error C. a random error D. an absolute error E. a systematic error

1997. In multiplication and division, the result is rounded to the

A. smallest number of significant figures among the data B. largest number of significant figures among the data C. number of decimal places in the least precise value D. same number of digits as the first value E. nearest whole number

1998. Dimensional analysis can be used to

A. count significant figures B. measure random errors C. check the homogeneity of an equation D. determine the direction of a vector E. find the numerical constant in a formula

1999. A speed of 72 km per hour is equal to

A. 20 m s-1 B. 10 m s-1 C. 25 m s-1 D. 7.2 m s-1 E. 36 m s-1

2000. The unit vectors i, j and k are directed along

A. the direction of motion only B. the field lines C. the x, y and z axes respectively D. any three arbitrary directions E. the resultant of three vectors

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