61.Which of the following is used in the manufacture of glass?
- A. Sodium chloride
- B. sodium trioxocarbonate
- C. sodium tetraoxosulphate (VI)
- D. sodium trioxonitrate (V)
62.Chlorine is produced commercially by
- A. electrolysis of dilute hydrochloric acid
- B. electrolysis of brine
- C. neutralization of hydrogen chloride
- D. heating potassium trioxochlorate (V)
63.Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of
- A. barium chloride solution
- B. dilute hydrochloric acid
- C. lead nitrate solution
- D. calcium chloride solution
64.The following equation H₂O + 2Fe²⁺ + Cl₂ <----> 2Fe³⁺ + 2Cl⁻ + H₂O
- A. Fe²⁺
- B. Cl₂
- C. Fe²⁺
- D. Cl⁻
65.Which of the following changes is physical?
- A. adding iron filling to water
- B. adding sodium metal to water
- C. cooling a solution of iron (II) sulphate to obtain
- D. Cooling water to obtain ice
66.In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
- A. In the beaker
- B. In the conical flask
- C. In a burette
- D. In the standard flask
67.You are provided with five jars containing SO₂, CO₂, H₂, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely.
- A. pass each gas into lime water
- B. pass each gas into water and test with litmus
- C. pass each gas into concentrated sulphuric acid
- D. expose each gas to atmospheric air
68.200 cm³ of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was 158 cm³ . Estimate the percentage of oxygen in the air
69.30cm³ of oxygen at 10 atmosphere pressures is placed in a 20dm³ container. Calculate the new pressure if temperature is kept constant
- A. 6.7 atm
- B. 15.0 atm
- C. 60.0
- D. 60.0
70.Bond dissociation energy of 500 KJ mol⁻¹ may be assigned to
- A. ionic bonding
- B. covalent bonding
- C. hydrogen bonding
- D. metallic bonding
71.A mixture of iron and sulphur can be separated by dissolving the mixture in __
- A. steam
- B. dilute hydrochloric acid
- C. dilute sodium hydroxide
- D. benzene
72.A mixture of sand, ammonium chloride and sodium chloride is best separated by __
- A. sublimation followed by addition of water and filtration
- B. sublimation followed by addition of water and evaporation
- C. addition of water followed by filtration and sublimation
- D. addition of water followed by crystallization and sublimation
73.A pure solid usually melts __
- A. over a wide range of temperature
- B. over a narrow range of temperature
- C. at a lower temperature than the impure one
- D. at the same temperature as the impure one
74.A small quantity of solid ammonium chloride was heated gently in a test tube; the solid gradually disappeared to produce a mixture of two gases. Later a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone __
- A. distillation
- B. sublimation
- C. precipitation
- D. evaporation
75.CH₄ has this geometry:
- A. trigonal
- B. planar
- C. tetrahedral
- D. octahedral
76.Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5. The relative abundance of the isotope of mass number 37 is ___
77.Elements P, Q, R, S, have 6, 11, 15 and 17 electrons respectively, therefore
- A. P will form an electrovalent bond with R
- B. Q will form a covalent bond with S
- C. R will form an electrovalent bond with S
- D. Q will form an electrovalent bond with S
78.In the oil drop experiment, Millikan determined the
- A. charge to mass ratio of the electron
- B. mass of the electron
- C. charge of the electron
- D. mass of the proton
79.One of these atomic shells is the most stable
80.Sieving is a technique used to separate mixtures containing 20% oxygen by volume. Which of the reactants was in excess?
- A. Carbon (II) oxide
- B. Oxygen
- C. Carbon (IV) oxide
- D. Nitrogen