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Showing 926 to 950 of 3046 questions (page 38 of 122).

926. Enzyme catalysed reactions are highly

A. specific B. endothermic C. irreversible at all temperatures D. non-specific E. independent of pH

927. The modern periodic law states that the properties of elements are a periodic function of their

A. density B. atomic mass C. atomic number D. atomic volume E. valency

928. Across a period from left to right, atomic radius generally

A. increases then decreases B. decreases C. doubles D. remains constant E. increases

929. Ionization energy generally decreases

A. for half filled subshells B. with decreasing atomic size C. across a period D. down a group E. with increasing nuclear charge

930. Lithium shows a diagonal relationship with

A. aluminium B. sodium C. beryllium D. calcium E. magnesium

931. Hydration energy of an ion increases with

A. increasing charge density B. increasing atomic mass C. increasing ionic size D. decreasing charge density E. decreasing charge

932. The flame colour given by potassium compounds is

A. crimson B. apple green C. golden yellow D. brick red E. lilac

933. The chemical formula of plaster of Paris is

A. CaO B. Ca(OH)2 C. CaSO4.(1/2)H2O D. CaSO4.2H2O E. CaCO3

934. In the Solvay process, the raw materials used are

A. calcium chloride and ammonia only B. sodium sulphate and coke C. potassium chloride and water D. sodium chloride, limestone and ammonia E. sodium hydroxide and chlorine

935. Lime water turns milky on passing carbon dioxide because of the formation of

A. calcium carbonate B. calcium oxide C. calcium hydroxide D. carbonic acid E. calcium bicarbonate

936. Boron trifluoride acts as a Lewis acid because boron

A. forms hydrogen bonds B. is a metal C. has a lone pair D. has an incomplete octet E. is highly electronegative

937. Aluminium oxide is described as amphoteric because it reacts with

A. bases only B. both acids and bases C. neither acids nor bases D. acids only E. water only

938. The reluctance of the ns2 electrons to take part in bonding in heavier p-block elements is called

A. hyperconjugation B. the diagonal relationship C. the inert pair effect D. the shielding effect E. the lanthanide contraction

939. The strongest oxidizing agent among the halogens is

A. astatine B. iodine C. chlorine D. bromine E. fluorine

940. Bleaching powder is prepared by passing chlorine over

A. dry slaked lime B. sodium hydroxide solution C. calcium sulphate D. quicklime E. limestone

941. Which oxide of nitrogen is known as laughing gas?

A. N2O5 B. N2O C. N2O3 D. NO E. NO2

942. A transition element is one that has a partially filled

A. s subshell B. f subshell C. d subshell D. p subshell E. valence shell of eight electrons

943. The colour of most transition metal ions in solution is due to

A. d to d electronic transitions B. ionic size C. s to p transitions D. hydrogen bonding E. nuclear transitions

944. In the complex ion hexaamminecobalt(III), the coordination number of cobalt is

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

945. EDTA is an example of a

A. monodentate ligand B. bidentate ligand C. hexadentate chelating ligand D. neutral molecule that cannot coordinate E. cation

946. Transition metals show variable oxidation states because

A. their ionization energies are very high B. they are all diamagnetic C. their atomic radii are large D. the energies of the ns and (n-1)d electrons are close E. they form only ionic compounds

947. The hybridization of each carbon atom in ethene is

A. sp3d B. sp2 C. sp3 D. sp3d2 E. sp

948. The halogenation of alkanes in sunlight proceeds by a

A. free radical substitution mechanism B. nucleophilic substitution mechanism C. electrophilic addition mechanism D. rearrangement E. elimination mechanism

949. According to Markownikoff's rule, addition of hydrogen bromide to propene gives mainly

A. 1,2-dibromopropane B. 1-bromopropane C. propane D. propan-1-ol E. 2-bromopropane

950. Benzene characteristically undergoes

A. elimination B. electrophilic addition C. electrophilic substitution D. nucleophilic addition E. free radical addition

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