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Showing 1326 to 1350 of 3046 questions (page 54 of 122).

1326. Permanent hardness of water is caused mainly by dissolved

A. calcium and magnesium sulphates and chlorides B. potassium nitrate C. sodium chloride D. dissolved carbon dioxide E. calcium and magnesium bicarbonates

1327. Caustic soda is the common name for

A. sodium bicarbonate B. calcium hydroxide C. sodium chloride D. sodium hydroxide E. sodium carbonate

1328. Graphite conducts electricity because

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

1329. Ammonia is manufactured industrially by the

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

1330. Sulphur dioxide acts as a bleaching agent by

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

1331. Anhydrous copper sulphate is white while the pentahydrate is blue because the colour arises from

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

1332. The catalyst used in a vehicle catalytic converter is mainly

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

1333. In naming a complex ion, the ligands are cited

A. only if they are anionic B. at random C. in order of charge only D. before the metal in alphabetical order E. after the metal

1334. Geometrical isomerism in alkenes arises because of

A. resonance B. restricted rotation about the double bond C. hydrogen bonding D. the presence of a chiral centre E. free rotation about the double bond

1335. Optical isomerism requires the presence of

A. a hydrogen bond B. an aromatic ring C. a carbon atom bonded to four different groups D. a lone pair E. a double bond

1336. An electrophile is a species that

A. donates a proton only B. accepts an electron pair C. is always negatively charged D. donates an electron pair E. contains a lone pair always

1337. The order of stability of carbocations is

A. primary greater than secondary greater than tertiary B. primary greater than tertiary C. all equal D. secondary greater than tertiary greater than primary E. tertiary greater than secondary greater than primary

1338. Polythene is obtained from ethene by

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

1339. Hydrogenation of vegetable oils to make vanaspati ghee uses a catalyst of

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

1340. The catalyst used for the chlorination of benzene is

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

1341. The order of reactivity of alkyl halides towards nucleophilic substitution is

A. R-Cl greater than R-I B. all equal 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-Br greater than R-F greater than R-I

1342. Industrial ethanol is produced by the fermentation of

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

1343. Denatured alcohol is ethanol that has been made unfit for drinking by adding

A. salt B. methanol and other additives C. water D. sugar E. glycerol

1344. Glycerol is classified as

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

1345. Diethyl ether was formerly used as

A. a fertilizer B. a fuel additive C. a general anaesthetic D. a preservative for food E. a bleaching agent

1346. Aldehydes and ketones characteristically undergo

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

1347. Heating a carboxylic acid with ammonia gives, after loss of water,

A. a nitrile B. an amine C. an ester D. an amide E. an anhydride

1348. The general formula of a naturally occurring alpha amino acid is

A. RCH(NH2)COOH B. RCOOR C. RCHO D. RCH2CONH2 E. RCH(OH)COOH

1349. 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

1350. Starch gives a characteristic colour with iodine solution that is

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

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