Chemistry

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Showing 501 to 525 of 1398 questions (page 21 of 56).

501. Sodium carbonate is used industrially mainly in the manufacture of

A. plastics B. cement C. petrol D. glass E. fertilizer

502. Carbon monoxide is highly toxic because it

A. decomposes in the lungs B. is acidic C. dissolves in water D. reacts with nitrogen E. binds strongly to haemoglobin in place of oxygen

503. The catalyst used in the contact process for manufacturing sulphuric acid is

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

504. Silicon carbide is used as an abrasive because it is

A. metallic B. highly ionic C. a covalent network solid of great hardness D. volatile E. a soft molecular solid

505. Concentrated nitric acid acts on copper mainly as

A. a base B. a catalyst C. a dehydrating agent D. an oxidizing agent E. a reducing agent

506. The bleaching action of chlorine water is due to

A. reduction of the dye B. chlorine gas dissolving the dye C. hydrogen gas D. hydrochloric acid E. nascent oxygen from hypochlorous acid

507. The oxidation state of chromium in the dichromate ion is

A. +6 B. +2 C. +3 D. +7 E. +4

508. Paramagnetism in transition metal compounds is due to

A. the nucleus B. lattice vibrations C. delocalized pi bonds D. unpaired d electrons E. paired electrons

509. Stainless steel is an alloy of iron with

A. lead and zinc B. copper and tin C. chromium and nickel D. carbon only E. aluminium and silicon

510. In acidic medium, permanganate ion is reduced to

A. Mn3+ B. Mn2+ C. MnO4 2- D. Mn metal E. MnO2

511. Successive members of a homologous series differ by

A. H2 B. CH3 C. C2H4 D. CH4 E. CH2

512. The number of structural isomers of butane, C4H10, is

A. 2 B. 5 C. 4 D. 1 E. 3

513. The Wurtz reaction is used to prepare

A. alkynes from dihalides B. symmetrical alkanes from alkyl halides C. alcohols from esters D. alkenes from alcohols E. ketones from acids

514. Dehydration of ethanol with concentrated sulphuric acid gives

A. ethanoic acid B. ethane C. ethene D. ethanal E. ethyne

515. Baeyer's reagent, dilute alkaline potassium permanganate, is used to test for

A. carboxylic acids B. amines C. unsaturation in hydrocarbons D. aldehydes E. alcohols

516. Ethyne is prepared in the laboratory by the action of water on

A. calcium sulphate B. calcium chloride C. calcium oxide D. calcium carbide E. calcium carbonate

517. The catalyst used in Friedel Crafts alkylation of benzene is

A. concentrated sulphuric acid B. nickel C. vanadium pentoxide D. sodium hydroxide E. anhydrous aluminium chloride

518. The nitrating mixture used for the nitration of benzene consists of

A. dilute nitric acid alone B. concentrated nitric and concentrated sulphuric acids C. nitrous acid and ethanol D. nitric acid and sodium hydroxide E. ammonium nitrate and water

519. Vigorous oxidation of toluene with alkaline potassium permanganate gives

A. benzaldehyde B. benzene C. cyclohexanol D. benzoic acid E. phenol

520. A tertiary alkyl halide undergoes nucleophilic substitution mainly by

A. free radical substitution B. the SN2 mechanism C. the SN1 mechanism D. E2 elimination only E. addition

521. Treatment of an alkyl halide with alcoholic potassium hydroxide gives mainly

A. an alcohol B. an amine C. an ether D. an acid E. an alkene

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

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

523. Lucas reagent is used to distinguish between

A. primary, secondary and tertiary alcohols B. aldehydes and ketones C. amines and amides D. alkanes and alkenes E. acids and esters

524. Williamson synthesis is used to prepare

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

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

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

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