Mixed Practice

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Showing 2076 to 2100 of 3046 questions (page 84 of 122).

2076. In the reaction of nitrogen with hydrogen to form ammonia, 1 mol of nitrogen reacting completely gives ammonia of amount

A. 0.5 mol B. 1.5 mol C. 3 mol D. 2 mol E. 1 mol

2077. Fractional crystallization is used to separate

A. two solids of different solubilities from the same solution B. two gases C. a solid from a gas D. two immiscible liquids E. isotopes

2078. Decantation is suitable when the precipitate is

A. gaseous B. volatile C. heavy and settles quickly D. very fine and colloidal E. soluble in the solvent

2079. In column chromatography, the component that is most strongly adsorbed on the stationary phase

A. travels slowest and is eluted last B. does not move at all C. travels fastest D. changes colour E. dissolves the column

2080. In a mixture of 2 mol of nitrogen and 3 mol of oxygen, the mole fraction of oxygen is

A. 0.2 B. 1.5 C. 0.5 D. 0.4 E. 0.6

2081. If the mole fraction of oxygen in a gas mixture at 2 atm total pressure is 0.25, its partial pressure is

A. 8 atm B. 0.5 atm C. 1 atm D. 0.25 atm E. 2 atm

2082. Which gas would be expected to show the greatest deviation from ideal behaviour?

A. hydrogen B. ammonia C. helium D. neon E. nitrogen

2083. The difference between evaporation and boiling is that boiling

A. occurs throughout the liquid at a fixed temperature B. lowers the temperature C. occurs only at the surface D. requires no heat E. occurs at all temperatures

2084. The number of atoms per unit cell in a simple cubic lattice is

A. 8 B. 4 C. 6 D. 1 E. 2

2085. Lattice energy of an ionic compound increases with

A. decreasing charges B. increasing coordination number only C. increasing ionic charges and decreasing ionic radii D. increasing temperature E. increasing ionic radii

2086. Hydrogen fluoride exists in the liquid state as zig zag chains because of

A. London forces only B. hydrogen bonding between molecules C. covalent network bonding D. metallic bonding E. ionic bonding

2087. Orbitals of the same subshell that have equal energy in an isolated atom are described as

A. degenerate B. antibonding C. saturated D. polar E. hybrid

2088. The dual nature of matter was proposed by

A. de Broglie B. Chadwick C. Dalton D. Rutherford E. Bohr

2089. The bond angle in boron trifluoride is

A. 90 degrees B. 104.5 degrees C. 120 degrees D. 180 degrees E. 109.5 degrees

2090. The sulphur dioxide molecule is

A. tetrahedral B. trigonal planar C. square planar D. linear E. bent

2091. A molecule may contain polar bonds and still have no net dipole moment if it is

A. paramagnetic B. symmetrical so that the bond dipoles cancel C. hydrogen bonded D. ionic E. linear only

2092. The number of sigma bonds in a methane molecule is

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

2093. On an enthalpy level diagram for an exothermic reaction, the products lie

A. above the activated complex B. at zero enthalpy C. below the reactants D. at the same level as the reactants E. above the reactants

2094. Raising the temperature of 100 g of water by 10 K requires about

A. 41.8 J B. 418 J C. 4180 J D. 10 J E. 41800 J

2095. An aqueous solution of ammonium chloride is

A. neutral B. acidic C. basic D. amphoteric E. a buffer of pH 7

2096. For the reaction in which one mole of gas gives two moles of gas, an increase in volume at constant temperature

A. shifts the equilibrium to the right B. stops the reaction C. has no effect D. shifts the equilibrium to the left E. decreases Kc

2097. In an acid base titration, the point at which the amounts of acid and base are chemically equivalent is the

A. neutral point of water B. buffer region C. end point of the indicator only D. equivalence point E. isoelectric point

2098. Diluting 10 cm3 of a 2 mol dm-3 solution to a total volume of 100 cm3 gives a concentration of

A. 2 mol dm-3 B. 20 mol dm-3 C. 0.2 mol dm-3 D. 0.02 mol dm-3 E. 0.5 mol dm-3

2099. The mole fraction of the solute in a solution of 1 mol of solute in 9 mol of solvent is

A. 1.0 B. 0.09 C. 0.9 D. 0.11 E. 0.1

2100. A concentration expressed as percentage weight by volume means grams of solute per

A. mole of solvent B. 100 cm3 of solution C. 100 g of solution D. 1 dm3 of solvent E. 1 kg of solvent

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