Chemistry

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Showing 1051 to 1075 of 1398 questions (page 43 of 56).

1051. For a zero order reaction, the rate is

A. proportional to the concentration of the reactant B. independent of the concentration of the reactant C. proportional to the square of the concentration D. zero at all times E. inversely proportional to concentration

1052. The Arrhenius equation relates the rate constant to

A. pressure and volume B. enthalpy and entropy C. concentration and volume D. pH and temperature E. temperature and activation energy

1053. Enzyme catalysed reactions are highly

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

1054. 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. valency E. atomic volume

1055. Across a period from left to right, atomic radius generally

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

1056. Ionization energy generally decreases

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

1057. Lithium shows a diagonal relationship with

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

1058. Hydration energy of an ion increases with

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

1059. The flame colour given by potassium compounds is

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

1060. The chemical formula of plaster of Paris is

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

1061. In the Solvay process, the raw materials used are

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

1062. Lime water turns milky on passing carbon dioxide because of the formation of

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

1063. 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

1064. Aluminium oxide is described as amphoteric because it reacts with

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

1065. The reluctance of the ns2 electrons to take part in bonding in heavier p-block elements is called

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

1066. The strongest oxidizing agent among the halogens is

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

1067. Bleaching powder is prepared by passing chlorine over

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

1068. Which oxide of nitrogen is known as laughing gas?

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

1069. A transition element is one that has a partially filled

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

1070. The colour of most transition metal ions in solution is due to

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

1071. In the complex ion hexaamminecobalt(III), the coordination number of cobalt is

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

1072. EDTA is an example of a

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

1073. Transition metals show variable oxidation states because

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

1074. The hybridization of each carbon atom in ethene is

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

1075. The halogenation of alkanes in sunlight proceeds by a

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

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