Chemistry

Free set

Showing 601 to 625 of 1398 questions (page 25 of 56).

601. 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

602. 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

603. 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

604. 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

605. 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

606. Polythene is obtained from ethene by

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

607. 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

608. The catalyst used for the chlorination of benzene is

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

609. 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

610. Industrial ethanol is produced by the fermentation of

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

611. 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

612. Glycerol is classified as

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

613. 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

614. Aldehydes and ketones characteristically undergo

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

615. 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

616. 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

617. 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

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

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

619. Detergents work better than soaps in hard water because their calcium and magnesium salts are

A. soluble B. insoluble C. volatile D. coloured E. acidic

620. Urea is manufactured by reacting ammonia with

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

621. Eutrophication of a lake is caused mainly by

A. acid rain alone B. excess chlorine C. low temperature D. excess nutrients such as nitrates and phosphates E. high dissolved oxygen

622. Dissolved oxygen in a river falls when organic pollution rises because

A. the water becomes acidic B. oxygen reacts with the pollutant directly only C. the temperature falls D. the pollutant displaces the oxygen physically E. micro-organisms consume oxygen while decomposing the organic matter

623. Infrared spectroscopy is used chiefly to identify

A. isotopes B. functional groups C. molar mass D. optical activity E. crystal structure

624. The value of Avogadro's number is

A. 6.02 x 10^24 B. 3.01 x 10^23 C. 6.02 x 10^23 D. 6.02 x 10^22 E. 1.66 x 10^-24

625. The molar volume of an ideal gas at standard temperature and pressure is

A. 11.2 dm3 B. 44.8 dm3 C. 24 dm3 D. 22.414 dm3 E. 1 dm3

Previous 1 2 … 23 24 25 26 27 … 55 56 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans