Chemistry

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Showing 1176 to 1200 of 1398 questions (page 48 of 56).

1176. 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

1177. Reaction of an alkyl halide with potassium cyanide gives a

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

1178. 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

1179. Williamson synthesis is used to prepare

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

1180. Formalin is an aqueous solution containing about 40 per cent

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

1181. 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

1182. 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

1183. Soap is manufactured by the alkaline hydrolysis of fats, a process called

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

1184. Aspirin is chemically

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

1185. The monomer of polyvinyl chloride is

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

1186. Vulcanization of rubber involves heating it with

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

1187. The building blocks of nucleic acids are

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

1188. 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

1189. 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

1190. 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

1191. The octane number of a fuel measures its

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

1192. 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

1193. 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

1194. 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

1195. 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

1196. Avogadro's law states that equal volumes of all gases under the same conditions contain

A. equal numbers of atoms B. the same density C. equal masses D. equal numbers of molecules E. the same energy

1197. The number of moles present in 4.4 g of carbon dioxide is

A. 0.01 B. 1.0 C. 0.2 D. 0.44 E. 0.1

1198. The percentage of oxygen by mass in water is about

A. 33.3% B. 88.9% C. 66.7% D. 50% E. 11.1%

1199. The complete combustion of one mole of methane requires oxygen of amount

A. 3 mol B. 2 mol C. 0.5 mol D. 1.5 mol E. 1 mol

1200. For solvent extraction to work, the two solvents used must be

A. both aqueous B. chemically identical C. immiscible with each other D. of the same density E. miscible with each other

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