Chemistry

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Showing 1251 to 1275 of 1398 questions (page 51 of 56).

1251. Graphite conducts electricity because

A. it contains free protons B. it is amorphous C. each carbon has one delocalized electron in a layer structure D. its atoms are sp3 hybridized E. it has ionic bonds

1252. Ammonia is manufactured industrially by the

A. Ostwald process B. Haber process C. contact process D. Bosch process E. Solvay process

1253. Sulphur dioxide acts as a bleaching agent by

A. reduction B. adsorption only C. hydrolysis D. precipitation E. oxidation

1254. Anhydrous copper sulphate is white while the pentahydrate is blue because the colour arises from

A. water molecules coordinated to the copper ion B. impurities C. hydrogen bonding alone D. the crystal shape E. the sulphate ion

1255. The catalyst used in a vehicle catalytic converter is mainly

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

1256. 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

1257. 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

1258. 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

1259. 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

1260. 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

1261. Polythene is obtained from ethene by

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

1262. 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

1263. The catalyst used for the chlorination of benzene is

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

1264. 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

1265. Industrial ethanol is produced by the fermentation of

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

1266. 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

1267. Glycerol is classified as

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

1268. 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

1269. Aldehydes and ketones characteristically undergo

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

1270. 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

1271. 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

1272. 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

1273. Starch gives a characteristic colour with iodine solution that is

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

1274. 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

1275. Urea is manufactured by reacting ammonia with

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

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