SSS Two Chemistry Obj Exams questions

Chemistry objective Examination questions for SSS Two

1. PCl₅(i) ↔ PCl₃(g) ∆H = +ve. In the reaction above, the forward reaction is favoured by
A. Increasing the size of the containing vessel
B. adding a catalyst
C. increasing the pressure
D. increasing the temperature
2. In an endothermic reaction, if there is a loss in entropy, the reaction will
A. not be spontaneous
B. be at equilibrium
C. be intermediate
D. be spontaneous
3. Which of the following is a hygroscopic substance?
A. NaNO₃
B. MgCl₂
C. FeCl₃
D. CaCl₂
4. 2SO₂(g) + O₂ → 2SO₃ ∆H = -ve. In the reaction above, the concentration of SO₃(g) can be increased by
A. Increasing the temperature
B. the addition of catalyst
C. deceasing the pressure
D. decreasing the temperature position shift to the product side
5. 3Fe(s) + 4H ₂O → Fe ₃O₄(s) + 4H ₂(g). the equilibrium constant K of the reaction above is represented as
A. {H₂}⁴/{H₂O₄}
B. {Fe}3{H₂}⁴/{Fe₃O₄}{H₂}⁴
C. {Fe₃O₄}{H₂}/{Fe}{H₂O}
D. {Fe₃O₄}{H₂}⁴/{Fe}3{H₂O}⁴
6. An element X has electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵.
Which of following statements is correct about the elements?
A. it has a completely filled porbital
B. it has 5 electrons in its outermost shell
C. it belongs to group II in the periodic table
D. it is a halogen
7. In a chemical reaction, when the energy of the colliding reactant particles is less than the activation energy, the reaction will
A. be spontaneous
B. not occur
C. occur
D. be slow
8. The minimum amount of energy required for a reaction to take place is
A. Activation energy
B. Kinetic energy
C. Lattice energy
D. ionization energy
9. Which of the following halogens is the most reactive
A. Cl₂
B. I₂
C. Br₂
D. F₂
10. Beryllium and aluminum have similar properties because they
A. are both metals
B. belongs to the same group
C. belongs to the same period
D. are positioned diagonally to each other.
11. One of the methods used for combating air pollution is
A. burning of solid waste
B. provision of sanitary landfills
C. legislation against some industrial practice
D. scavenging of refuse dumps
12. N₂O₄(g) ↔ 2NO₂(s). In the endothermic reaction above more products formed will be favoured
A. a constant values
B. an increase in pressure
C. a decrease in pressure
D. a decrease in volume
13. Elements in the same group of the periodic table have
A. similar electronic configuration
B. similar orbital configuration
C. the same number of valence electron
D. the same number of electron
14. Which of the following gases contains the least number of atoms at stp?
A.1 mole of butane
B. 3 mole of ozone
C. 4 moles of chlorine
D. 7 moles of oxygen
15. Which of the following results in the fall of acid rain?
A. oxide of lead
B. particulate matter
C. oxides of sulphur
D. gaseous hydrocarbon
16. One of these is not water pollution
A. petroleum
B. domestic liquid and solid water
C. industrial effluent
D. biodegradable chemicals
17. The furring of kettles is caused by the presence of
A. calcium tetraoxosulphate(IV)
B. calcium hydrogentrioxocarbonate(IV)
C. calcium hydroxide
D. calcium trioxocarbonate (IV)
18. What value of gas is evolved at STP, if 2g of calcium trioxocarbonate(IV) is added to a solution of hydrochloric acid. (Ca=40, C=12, O=16, Cl=35.5, H=1) molar volume of gas at STP = 22.4dm³
A. 112cm³
B. 224cm³
C. 448cm³
D. 2240cm³
19. According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to
A. Decrease
B. increase
C. remain constant
D. be zero
20. A good drying agent should be
A. Deliquescent
B. effervescent
C. Hygroscopic
D. efflorescent
21. NH₃(g) + HCl(s) → NH₄Cl(s). The entropy change in the system above is
A. positive
B. zero
C. negative
D. intermediate
22. An electron can be added to a halogen atom to form a halide ion with
A. 2 valence electron
B. 3 valence electron
C. 7 valence electron
D. 8 valence electron
23. The element that belong to the third period of the periodic table are
A. Li, Be, Al
B. Na, P, O and Cl
C. B, C, N and O
D. N₂, Mg, S and Ar
24. An element used in the production of matches is
A. Nitrogen
B. Aluminum
C. copper
D. sulphur
25. Rare gases are stable because they
A. are monoatomic
B. form ions easily
C. have duplet or octet electronic configuration in the outermost shells in their atoms.
D. are volatile gases
26. In the periodic table, the electrical and thermal conductivities are properties of elements that
A. decrease across the period and increase down the group
B. increase across the period and decrease down the group
C. decrease the period and down the group
D. increase across the period and down the group
27. Steam changes the colour of anhydrous cobalt(II) chloride from
A. white to green
B. white to red
C. blue to pink
D. white to blue
28. In a water body, too much of sewage leads to
A. a decrease in the temperature of water which causes death of the aquatic animals
B. an increase in the number of aquatic animal
C. an increase in the bacteria population which reduces the level of oxygen in the water
D. a decrease in the bacterial population which increases the level of oxygen in the water
29. 2Na(s) + 2H₂O(i) → 2NaOH(aq) + H₂(g). From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium {H=1, O=16, Na=23}
A. 0.40g
B. 0.8g
C. 4.00g
D. 8.00g
30. The atom of an element X is represented as ^y_z𝑋. The basic chemical properties of X depend on value of
A. Y
B. Z
C. Y-Z
D. Z-Y
31. Which of these cell notations is correct representation of Daniel cell?
A. Zn(s)/Zn²⁺(aq) //Cu²⁺(aq) /Cu(s)
B. Cu(s)/Cu²⁺(aq) //Zn²⁺(aq)/Zn(s)
C. Zn²⁺(aq)/Zn(s) //Cu²⁺(aq)/Cu(s)
D. Cu²⁺(aq)/Cu(s) // Zn(s)/Zn²⁺(aq)
32. Which of the species undergoes reduction in the reaction represented by the equation below H₂S(aq) +2FeCl₃(aq) S(s) + 2HCl(aq) + 2FeCl₃(aq)
A. Fe3+
B. H₂S
C. Cl-
D. S
33. What is the oxidation number of chromium in K₂CrO₄^-?
A. +1
B. +2
C. +4
D. +6
34. What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrons?
A. chlorine
B. hydrogen
C. oxygen
D. sodium
35. When sodium atom forms the ion Na²⁺
A. it gains one electron
B. it gains one proton
C. it achieves a noble gas configuration
D. its atomic number increases
36. What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 minutes? [1F=96500C]
A. 0.11F
B. 0.12F
C. 0.22F
D. 1.1F
37. What is the change in the oxidation number of phosphorus in the reaction represented by the following equation. 4P(s) + 5O₂(g) → 2P₂O₅(s).
A. 0 to +2
B. 0 to +5
C. +4 to +2
D. +4 to +5
38. What is the value of n in the following equation? XO₄^- + 8H⁺ + ne → X₂⁺ + 4H₂O.
A. 2
B. 3
C. 4
D. 5
39. Oxidation takes place at the anode during electrolysis because the anode
A. is deficient in electrons
B. is rich in electrons
C. has excess electrons
D. has attraction for positive ions
40. Energy conversion in an electrolytic cell is
A. electrical to chemical
B. electrical to light
C. electrical to mechanical
D. chemical to electrical
41. Which of the following methods cannot be used to distinguish between a strong acid and a weak acid?
A. conductivity measurement
B. measurement of pH
C. measurement of heat of reaction
D. action on starch iodide paper
42. Equal volumes of water were added to one mole of each of the following compounds, which of them produced the largest number of ions?
A. glucose
B. sodium trioxonitrate(V)
C. ethanoic
D. silver chloride
43. The solution that will conduct the highest amount of electricity is
A. 2.0moldm^-3 ethanoic acid
B. 0.5moldm^-3 ethanoic acid
C. 2.0moldm^-3 of hydrochloric acid
D. 0.5moldm^-3 of hydrochloric acid
44. In the conductance of aqueous potassium tetraoxosulphate(VI) solution, the current carriers are the
A. ions
B. electrons
C. hydrated ions
D. hydrated electrons
45. Which of the following metals is purified commercially by electrolysis?
A. Zn
B. Fe
C.Sn
D. Cu
46. Electrolysis CANNOT be used to
A. electroplate metals
B. extracted elements
C. generate electricity
D. purify metals
47. Calculate the time it will take 9600C of electricity to be produced when a current of 1.6A is use
D.
A. 0.5minutes
B. 1.0minutes
C. 10.0minutes
D. 100minutes
48. Consider the reaction represented by the following equation. Fe²⁺(aq) + 2e^- → Fe(s). How many moles of electrons are required to liberate 112g of ion? [Fe=56]
49. A quantity of electricity liberates 3.6g of silver from its salt. What mass of aluminum will be liberated from its salt by the same quantity of electricity? [Al=27; Ag=108]
A. 2.7g
B. 1.2g
C. 0.9g
D. 0.3g
50. The oxidation number of X in XO₄^3- is
A. +1
B. +2
C. +3
D. +5
51. A reducing agent is expected to < br>A. decolourize acidified KMnO₄ solution.
B. liberate Cl₂ from a chloride.
C. decoulourize acidified FeSO₄ solution.
D. liberate CO₂ from NaHCO₃.
52. In a Leclanche- cell, the anode is normally
A. ammonium chloride plate.
B. carbon rod
C. magnesium (IV) oxide.
D. Zinc container.
53. Consider the cell represented below.
Mg (s)/ Mg²⁺ (aq) // Pb²⁺ (aq)/ Pb (s)
Which of the following statements is correct about the cell?
A. it is an electrolytic cell.
B. Pb is oxidized to Pb²⁺
C. Each single line represent a salt bridge.
D. Mg is oxidized to Mg²⁺ .
54. The following are reactions that occur in motor car batteries EXCEPT
A. PbO₂(s) + 4H⁺(aq) + 2e^- → Pb²⁺(aq+2H₂O(s)
B. Pb²⁺(aq) + SO₄^-(aq) → PbSO₄
C. Pb²⁺(aq) + 2e^- → Pb(s)
D. Pb(s) + H₂SO₄(aq) → PbSO₄(s) + 2H⁺(aq)
55. A metal which can be used as a sacrificial anode for preventing corrosion of a length of ion pipe is
A. copper
B. magnesium
C. silver
D. lead
56. Zinc bars can be attached to iron structures to prevent them from rusting, this process is based on
A. removal of moisture
B. Cathodic protection
C. removal of impurities
D. electroplating
57. What will happen if aluminum spoon is used to stir a solution of iron(II) trioxonitrate(V)?
A. the spoon will increase in size
B. the spoon will reduced
C. the spoon will be oxidized while the iron(II) ions will be reduced to be metal
D. the spoon will be reduced while the iron(II) ions will be oxidized
58. Which of the following substances decomposes, when electric current is passed through it?
A. glucose solution
B. hydrochloric acid
C. zinc rod
D. tetrachloro methane
59. H₂S(g) + Br₂(g) + S(s).
n the above equation, bromine is
A. an acid
B. a base
C. an electron donor an oxidizing agent
60. Consider the reaction represented by xIO₃^- + yI ^- + 6H⁺ → zH₂O + 3I₂. What are the values of x, y and z respectively.
A. 5, 3,1
B. 5,5,3
C. 3,1,5
D. 1,5,3