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Showing 2101 to 2125 of 3046 questions (page 85 of 122).

2101. The products of the electrolysis of molten sodium chloride are

A. sodium hydroxide and hydrogen B. chlorine and oxygen C. hydrogen and chlorine D. sodium and chlorine E. oxygen and sodium

2102. The oxidation number of chromium in the chromate ion is

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

2103. 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

2104. 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

2105. 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

2106. 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

2107. An enzyme requiring a non-protein component in order to function needs a

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

2108. 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

2109. 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

2110. 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

2111. 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

2112. 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

2113. 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

2114. 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

2115. Nitric acid is manufactured industrially by the

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

2116. 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

2117. 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

2118. 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+

2119. 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

2120. 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

2121. 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

2122. The number of structural isomers of pentane, C5H12, is

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

2123. 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

2124. Acid catalysed hydration of an alkene gives

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

2125. 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

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