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Chemistry

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Showing 301 to 325 of 1398 questions (page 13 of 56).

301. Baeyer's reagent, dilute alkaline potassium permanganate, is used to test for

A. aldehydes B. unsaturation in hydrocarbons C. alcohols D. carboxylic acids E. amines

302. Ethyne is prepared in the laboratory by the action of water on

A. calcium carbonate B. calcium carbide C. calcium oxide D. calcium sulphate E. calcium chloride

303. The catalyst used in Friedel Crafts alkylation of benzene is

A. concentrated sulphuric acid B. anhydrous aluminium chloride C. sodium hydroxide D. nickel E. vanadium pentoxide

304. The nitrating mixture used for the nitration of benzene consists of

A. dilute nitric acid alone B. concentrated nitric and concentrated sulphuric acids C. nitric acid and sodium hydroxide D. ammonium nitrate and water E. nitrous acid and ethanol

305. Vigorous oxidation of toluene with alkaline potassium permanganate gives

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

306. A tertiary alkyl halide undergoes nucleophilic substitution mainly by

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

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

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

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

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

309. Lucas reagent is used to distinguish between

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

310. Williamson synthesis is used to prepare

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

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

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

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

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

313. Reduction of a ketone with sodium borohydride gives

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

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

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

315. Aspirin is chemically

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

316. The monomer of polyvinyl chloride is

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

317. Vulcanization of rubber involves heating it with

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

318. The building blocks of nucleic acids are

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

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

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

320. The specificity of an enzyme is explained by the

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

321. Cracking of heavy petroleum fractions is carried out to

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

322. The octane number of a fuel measures its

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

323. Biochemical oxygen demand is a measure of

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

324. Primary treatment of waste water consists mainly of

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

325. Photochemical smog is formed mainly from

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

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