Chemistry

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Showing 1326 to 1350 of 1398 questions (page 54 of 56).

1326. Chromium is used for electroplating steel articles chiefly because it

A. resists corrosion and gives a bright hard finish B. melts at low temperature C. conducts heat well D. is magnetic E. is cheap

1327. The IUPAC name of the compound with formula CH3CH(CH3)CH2CH3 is

A. 2-methylpropane B. n-pentane C. 3-methylbutane D. 2-methylbutane E. isopentene

1328. The number of structural isomers of pentane, C5H12, is

A. 5 B. 2 C. 4 D. 3 E. 6

1329. A nucleophile is a species that

A. donates an electron pair to an electron deficient centre B. accepts an electron pair C. has no lone pair D. always carries a positive charge E. accepts a proton only

1330. Acid catalysed hydration of an alkene gives

A. an aldehyde B. an alcohol C. an alkane D. an ether E. a carboxylic acid

1331. Sulphonation of benzene is carried out using

A. nitric acid alone B. sodium hydroxide C. dilute hydrochloric acid D. aluminium chloride E. concentrated or fuming sulphuric acid

1332. Oxidation of a secondary alcohol gives

A. a ketone B. an aldehyde C. an alkene D. a carboxylic acid E. an ester

1333. Aliphatic amines are more basic than ammonia because the alkyl groups are

A. acidic B. electron releasing and increase the availability of the lone pair C. unable to donate electrons D. aromatic E. electron withdrawing

1334. The sequence of amino acids in a polypeptide chain constitutes the

A. active site only B. secondary structure C. quaternary structure D. tertiary structure E. primary structure of the protein

1335. The monomer of natural rubber is

A. isoprene B. vinyl chloride C. ethene D. butadiene E. styrene

1336. A thermosetting plastic differs from a thermoplastic in that it

A. is always transparent B. softens repeatedly on heating C. conducts electricity D. sets permanently on heating because of cross linking E. dissolves in water

1337. Lipids are hydrolysed by alkali to give glycerol and

A. alcohols only B. nucleotides C. salts of fatty acids D. monosaccharides E. amino acids

1338. Ozone depletion is most severe over

A. the Sahara B. the equator C. the Pacific Ocean D. northern Europe E. Antarctica

1339. Solid waste disposal by sanitary landfill requires lining of the site chiefly to

A. improve appearance B. speed up decay C. prevent leachate from contaminating groundwater D. allow gas to escape E. increase the temperature

1340. For an ionic compound such as sodium chloride, the correct term for NaCl is

A. a molecule B. an isotope C. a formula unit D. an atom E. a radical

1341. The number of moles of solute in 250 cm3 of a 0.4 mol dm-3 solution is

A. 1.6 B. 0.1 C. 0.4 D. 0.04 E. 1.0

1342. A gram molecule of a substance is

A. its relative molecular mass expressed in grams B. one molecule of the substance C. always 22.4 g D. the mass of one mole of atoms E. its atomic mass in grams

1343. A fractionating column improves separation because it provides

A. a drying agent B. a vacuum C. a larger heating surface D. many successive cycles of vaporization and condensation E. a catalyst

1344. A solute travels 4 cm while the solvent front travels 8 cm on a chromatogram. The Rf value is

A. 0.2 B. 4.0 C. 0.4 D. 2.0 E. 0.5

1345. One atmosphere of pressure is equal to

A. 10132 Pa B. 1000 Pa C. 760 Pa D. 101325 Pa E. 76 Pa

1346. A graph of pressure against volume at constant temperature for an ideal gas is

A. a straight line through the origin B. a hyperbola C. a vertical line D. a horizontal line E. a parabola

1347. Using the ideal gas equation, the number of moles in 4.48 dm3 of a gas at STP is

A. 0.4 B. 2.0 C. 0.2 D. 1.0 E. 0.1

1348. Ordinary glass is best described as

A. a gas B. a crystalline solid C. a network of ions D. an amorphous solid or supercooled liquid E. a true liquid

1349. The rise of a liquid in a narrow tube is greatest when the liquid

A. is very dense B. has high viscosity C. is non-polar D. does not wet the tube E. wets the tube and has high surface tension

1350. The permitted values of the spin quantum number are

A. plus one half and minus one half B. 0 and 1 C. only plus one half D. minus 1, 0 and plus 1 E. 1 and 2

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