Mixed Practice

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Showing 676 to 700 of 3046 questions (page 28 of 122).

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

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

677. Carbon monoxide is highly toxic because it

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

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

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

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

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

680. Concentrated nitric acid acts on copper mainly as

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

681. The bleaching action of chlorine water is due to

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

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

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

683. Paramagnetism in transition metal compounds is due to

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

684. Stainless steel is an alloy of iron with

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

685. In acidic medium, permanganate ion is reduced to

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

686. Successive members of a homologous series differ by

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

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

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

688. The Wurtz reaction is used to prepare

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

689. Dehydration of ethanol with concentrated sulphuric acid gives

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

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

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

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

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

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

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

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

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

694. Vigorous oxidation of toluene with alkaline potassium permanganate gives

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

695. A tertiary alkyl halide undergoes nucleophilic substitution mainly by

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

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

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

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

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

698. Lucas reagent is used to distinguish between

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

699. Williamson synthesis is used to prepare

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

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

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

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