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Showing 2576 to 2600 of 3046 questions (page 104 of 122).

2576. Vigorous oxidation of toluene with alkaline potassium permanganate gives

A. phenol B. benzaldehyde C. cyclohexanol D. benzoic acid E. benzene

2577. A tertiary alkyl halide undergoes nucleophilic substitution mainly by

A. the SN2 mechanism B. free radical substitution C. the SN1 mechanism D. addition E. E2 elimination only

2578. Treatment of an alkyl halide with alcoholic potassium hydroxide gives mainly

A. an amine B. an acid C. an ether D. an alcohol E. an alkene

2579. Reaction of an alkyl halide with potassium cyanide gives a

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

2580. Lucas reagent is used to distinguish between

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

2581. Williamson synthesis is used to prepare

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

2582. Formalin is an aqueous solution containing about 40 per cent

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

2583. Fehling's solution is reduced by aldehydes to give a precipitate of

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

2584. Reduction of a ketone with sodium borohydride gives

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

2585. Soap is manufactured by the alkaline hydrolysis of fats, a process called

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

2586. Aspirin is chemically

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

2587. The monomer of polyvinyl chloride is

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

2588. Vulcanization of rubber involves heating it with

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

2589. The building blocks of nucleic acids are

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

2590. Vitamins B and C are described as water soluble because they

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

2591. 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

2592. Cracking of heavy petroleum fractions is carried out to

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

2593. The octane number of a fuel measures its

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

2594. 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 hardness of water E. the chlorine content

2595. Primary treatment of waste water consists mainly of

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

2596. Photochemical smog is formed mainly from

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

2597. 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

2598. The dimensional formula of Young's modulus is

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

2599. A set of measurements that are closely grouped but far from the true value is described as

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

2600. 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. 0.9 mm C. 1 mm D. 0.05 mm E. 0.01 mm

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