Which of the following properties of atoms generally increases down a group in the periodic table?
- A. Electron affinity
- B. Electronegativity
- C. Ionic radius
- D. lonization energy
A transition metal would be expected to
- A. from oxides with different formulae
- B. have strong oxidizing ability
- C. have low density
- D. have an atomic structure with an incomplete outermost shell
In which of the following atoms is the ionic radius larger than the atomic radius? [11 Na, 12Mg,13AI,17CI]
- A. Aluminium
- B. Chlorine
- C. Magnesium
- D. Sodium
Which of the following properties is characteristic of the halogens?
- A. Ability to accept electrons readily
- B. Ability to donate electrons readily
- C. Ability to from basic oxides
- D. Formation of coloured compounds
Which of the following statements about rare gases are correct?
- A. Their outermost shells are fully filled
- B. They are generally unreactive
- C. Their outermost shells are partially filled
- D. They have lone pair of
When sodium atom form the ion Na+,
- A. it gains one proton
- B. it achieves a noble gas configuration
- C. its atomic number increases
- D. it gains one electron
Which of the following equations represents a substitution reaction?
- A. C 2H10(g) + CI 2(g) → C4H9 CI(g) + HCI(g)
- B. C 2H4(g) + HCI (g) → C 2H5 CI(l)
- C. C2H2(g) + 2H 2(g) → C 2H6(g)
- D. C 3H4(g) + 402(g) → 3CO2(g) + 2H 2O(g)
The ammonium compound used in the manufacture of dry cells is
- A. NH4NO3
- B. (NH4)SO4
- C. NHCI4
- D. (NH4)2CO3
Which of the following substance is an ore of iron?
- A. Bauxite
- B. Cassiterite
- C. Haematite
- D. Steel
Waste plastics accumulate in the soil and pollute the environment because plastic materials are
- A. insoluble in water
- B. non -biodegradable
- C. easily affected by heat
- D. inflammab,le
Greenhouse effect can be reduced by controlling
- A. water evaporation
- B. burning wood and fossil fuel
- C. the use of aerosols
- D. the use of artificial fertilizers
What is CaHb in the following equation? C a
H b + 5O2 → 3CO 2 + 4H2O
- A. C 3H4
- B. C3H6
- C. C3H8
- D. C 5H 10
Which of the following compounds is an alkanoate?
- A. CH3COOH
- B. CH3COOCH3
- C. CH3CH2OH
- D. CH3CH2COOH
What type of reaction occurs between vegetable oil and plant ash extract?
- A. Displacement
- B. Dehydration
- C. Neutralization
- D. Saponiflication
Which of the following industrial processes is chlorines not used?
- A. Production of polyvinylchloride (PVC)
- B. Manufacturing of hydrochloric acid
- C. Manufacturing of common salt
- D. Manufacturing of domestic bleach
In the reaction represented by the equation. 5Fe 2+ (aq) + MnO– 4(aq) + 8H+ (aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) which species is reduced?
- A. Fe2+
- B. MnO-4
- C. H+
- D. Fe3+
Consider the reaction: 2AI(s) + 6H+ (aq) → 2AI3+ (aq) + 3H2(g). What is the total number of moles of electrons transferred from the aluminium atoms to the hydrogen ions?
- A. 3
- B. 4
- C. 5
- D. 6
Metals can be extracted from their ores by a process involving
- A. reduction
- B. oxidation
- C. hydrolysis
- D. decomposition
The oxidation number of iodine in the iodate ion (IO –3) is
- A. -5
- B. -1
- C. +1
- D. +5
Electrolysis is applied in the following processes except
- A. electroplating
- B. extraction of aluminium
- C. extraction of iron
- D. purification of copper
Consider the reaction represented by the equation: 2SO\(_{2(g)}\) + O\(_{2(g)}\) ⇌ 2SO\(_{3(g)}\); ∆H = – 197 kJmol\(^{-1}\). Which of the following conditions will not increase the yield of sulphur (VI) oxide?
- A. Increase in temperature
- B. Decrease in temperature
- C. Increase in pressure
- D. Addition of O2 into the mixture