Mixed Practice

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Showing 1801 to 1825 of 3046 questions (page 73 of 122).

1801. Reaction of an alkyl halide with potassium cyanide gives a

A. ketone B. nitrile C. amine D. alcohol E. carboxylic acid directly

1802. Lucas reagent is used to distinguish between

A. primary, secondary and tertiary alcohols B. acids and esters C. alkanes and alkenes D. amines and amides E. aldehydes and ketones

1803. Williamson synthesis is used to prepare

A. amines B. alcohols C. aldehydes D. ethers E. esters

1804. Formalin is an aqueous solution containing about 40 per cent

A. formaldehyde B. acetaldehyde C. acetone D. ethanol E. formic acid

1805. Fehling's solution is reduced by aldehydes to give a precipitate of

A. copper metal B. copper(II) hydroxide C. silver D. cuprous chloride E. copper(I) oxide

1806. Reduction of a ketone with sodium borohydride gives

A. an alkane B. a secondary alcohol C. an aldehyde D. a primary alcohol E. a tertiary alcohol

1807. Soap is manufactured by the alkaline hydrolysis of fats, a process called

A. polymerization B. cracking C. esterification D. saponification E. hydrogenation

1808. Aspirin is chemically

A. salicylic acid B. acetylsalicylic acid C. phenol D. methyl salicylate E. benzoic acid

1809. The monomer of polyvinyl chloride is

A. chloroform B. propene C. vinyl chloride D. ethene E. styrene

1810. Vulcanization of rubber involves heating it with

A. sulphur B. phosphorus C. chlorine D. carbon E. nitrogen

1811. The building blocks of nucleic acids are

A. glycerols B. nucleotides C. monosaccharides D. amino acids E. fatty acids

1812. Vitamins B and C are described as water soluble because they

A. are proteins B. are stored in fat tissue C. contain several polar hydroxyl and amino groups D. contain long hydrocarbon chains E. are minerals

1813. The specificity of an enzyme is explained by the

A. band theory B. kinetic theory C. resonance theory D. lock and key model of the active site E. collision theory

1814. Cracking of heavy petroleum fractions is carried out to

A. increase the molar mass B. increase the boiling point C. remove sulphur only D. form aromatics only E. obtain lighter and more useful hydrocarbons

1815. The octane number of a fuel measures its

A. resistance to knocking B. volatility C. sulphur content D. density E. energy content

1816. Biochemical oxygen demand is a measure of

A. the total dissolved solids B. the acidity of water C. the oxygen required by micro-organisms to decompose organic matter in water D. the chlorine content E. the hardness of water

1817. Primary treatment of waste water consists mainly of

A. chlorination B. reverse osmosis C. biological oxidation D. physical removal of suspended solids by screening and sedimentation E. ion exchange

1818. Photochemical smog is formed mainly from

A. nitrogen oxides and unburnt hydrocarbons in sunlight B. ammonia and dust C. carbon dioxide and water D. sulphur dioxide and soot E. chlorofluorocarbons

1819. Two components can be separated by chromatography because they differ in

A. molar mass only B. density C. their relative affinity for the stationary and mobile phases D. colour E. melting point

1820. The dimensional formula of Young's modulus is

A. [M0L0T0] B. [ML-2T-1] C. [ML2T-2] D. [ML-1T-2] E. [MLT-2]

1821. A set of measurements that are closely grouped but far from the true value is described as

A. both accurate and precise B. accurate but not precise C. free from systematic error D. neither accurate nor precise E. precise but not accurate

1822. A vernier scale has 10 divisions coinciding with 9 divisions of a main scale graduated in millimetres. The least count is

A. 0.1 mm B. 0.05 mm C. 0.01 mm D. 0.9 mm E. 1 mm

1823. Which of the following pairs does not have the same dimensions?

A. frequency and angular velocity B. force and energy C. work and torque D. stress and pressure E. impulse and momentum

1824. If the rectangular components of a vector are equal in magnitude, the vector makes an angle with the x-axis of

A. 30 degrees B. 0 degrees C. 90 degrees D. 60 degrees E. 45 degrees

1825. The magnitude of the vector 3i + 4j - 12k is

A. 13 B. 19 C. 5 D. 7 E. 12

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