Mixed Practice

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Showing 2751 to 2775 of 3046 questions (page 111 of 122).

2751. In naming a complex ion, the ligands are cited

A. at random B. only if they are anionic C. in order of charge only D. before the metal in alphabetical order E. after the metal

2752. Geometrical isomerism in alkenes arises because of

A. hydrogen bonding B. restricted rotation about the double bond C. resonance D. the presence of a chiral centre E. free rotation about the double bond

2753. Optical isomerism requires the presence of

A. an aromatic ring B. a lone pair C. a carbon atom bonded to four different groups D. a double bond E. a hydrogen bond

2754. An electrophile is a species that

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

2755. The order of stability of carbocations is

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

2756. Polythene is obtained from ethene by

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

2757. Hydrogenation of vegetable oils to make vanaspati ghee uses a catalyst of

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

2758. The catalyst used for the chlorination of benzene is

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

2759. The order of reactivity of alkyl halides towards nucleophilic substitution is

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

2760. Industrial ethanol is produced by the fermentation of

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

2761. Denatured alcohol is ethanol that has been made unfit for drinking by adding

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

2762. Glycerol is classified as

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

2763. Diethyl ether was formerly used as

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

2764. Aldehydes and ketones characteristically undergo

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

2765. Heating a carboxylic acid with ammonia gives, after loss of water,

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

2766. 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

2767. Denaturation of a protein involves

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

2768. Starch gives a characteristic colour with iodine solution that is

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

2769. Detergents work better than soaps in hard water because their calcium and magnesium salts are

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

2770. Urea is manufactured by reacting ammonia with

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

2771. Eutrophication of a lake is caused mainly by

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

2772. Dissolved oxygen in a river falls when organic pollution rises because

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

2773. Infrared spectroscopy is used chiefly to identify

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

2774. An error that occurs in the same direction in every reading and does not average out is called

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

2775. 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. nearest whole number E. same number of digits as the first value

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