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Chemistry

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Showing 951 to 975 of 1398 questions (page 39 of 56).

951. In the ion electron method of balancing redox equations, the two half reactions are balanced for

A. mass only B. charge only C. temperature D. both mass and charge E. volume

952. A metal will displace hydrogen from dilute acid if its standard reduction potential is

A. negative B. positive C. greater than that of copper D. equal to that of silver E. zero

953. A reaction in which one of the products acts as a catalyst is described as

A. photochemical B. heterogeneous C. autocatalytic D. inhibited E. zero order

954. The rate of a reaction may be followed physically by measuring changes in

A. the molar mass of the reactants B. the atomic number C. the balanced equation D. the periodic group E. colour or electrical conductivity

955. An enzyme requiring a non-protein component in order to function needs a

A. substrate B. product C. denaturant D. buffer E. cofactor

956. A cation is always smaller than its parent atom because

A. it forms a covalent bond B. it gains electrons C. it becomes a noble gas D. loss of electrons reduces electron electron repulsion and increases effective nuclear charge per electron E. its nucleus shrinks

957. Hydrogen is difficult to place in the periodic table because it resembles

A. only the halogens B. both the alkali metals and the halogens in different respects C. the noble gases D. only the alkali metals E. the transition metals

958. The elements of the f block are collectively known as

A. transition elements B. metalloids C. inner transition elements D. noble gases E. representative elements

959. The vigour of reaction of the alkali metals with water

A. decreases down the group B. is greatest for lithium C. increases down the group D. is the same for all E. depends only on the temperature

960. The solubility of the hydroxides of the group two metals

A. decreases down the group B. increases down the group C. is the same throughout D. is zero for all E. is greatest for beryllium

961. The basic character of the oxides of the alkaline earth metals

A. decreases down the group B. is absent altogether C. is highest for beryllium D. remains the same E. increases down the group

962. Aluminium is extracted industrially by the electrolysis of alumina dissolved in

A. liquid ammonia B. water C. molten sodium chloride D. molten cryolite E. concentrated sulphuric acid

963. Nitric acid is manufactured industrially by the

A. contact process B. Ostwald process C. Haber process D. Solvay process E. Hall Heroult process

964. Chlorine displaces bromine from a solution of potassium bromide because chlorine is

A. a reducing agent B. less electronegative C. larger in size D. less reactive E. a stronger oxidizing agent

965. Sulphuric acid is described as a dehydrating agent because it

A. oxidizes metals B. reduces sulphates C. removes the elements of water from compounds D. adds water to compounds E. evaporates readily

966. Ferric ion differs from ferrous ion in that ferric is

A. Fe+ only B. Fe2+ and less oxidized C. Fe3+ and more oxidized D. uncharged E. Fe4+

967. Potassium dichromate is widely used in the laboratory as

A. a catalyst only B. an oxidizing agent in acidic medium C. a dehydrating agent D. a reducing agent E. a base

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

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

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

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

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

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

971. 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. accepts a proton only E. always carries a positive charge

972. Acid catalysed hydration of an alkene gives

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

973. Sulphonation of benzene is carried out using

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

974. Oxidation of a secondary alcohol gives

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

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

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

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