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Question 1 of 98
1. Question
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 158cm3, estimate the percentage of oxygen in the air.
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Question 2 of 98
2. Question
30cm3 of oxygen at 10 atmosphere pressures is placed in a 20dm3 container. Calculate the new pressure if temperature is kept constant
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Question 3 of 98
3. Question
Bond dissociation energy of 500kJ mof1 maybe assigned to
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Question 4 of 98
4. Question
A mixture of iron and sulphur can be separated by dissolving the mixture in
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Question 5 of 98
5. Question
A mixture of sand, ammonium chloride and sodium chloride is best separated by
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Question 6 of 98
6. Question
A pure solid usually melts
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Question 7 of 98
7. Question
A small quantity of solid ammonium chloride was heated gently in a test; 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
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Question 8 of 98
8. Question
Elements P,Q,R,S, have 6,11,15 and 17 electrons respectively, therefore
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Question 9 of 98
9. Question
In oil drop experiment, Millikan determined the
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Question 10 of 98
10. Question
One of these atomic shells is the most stable
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Question 11 of 98
11. Question
Sieving is a technique used to separate mixtures containing 20% oxygen by volume. Which of the reactants was in excess?
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Question 12 of 98
12. Question
The abnormally high boiling point of water is primarily due to
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Question 13 of 98
13. Question
The energy required to remove an electron from the isolated gaseous atom is known as
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Question 14 of 98
14. Question
The group that oxygen belongs to is collectively called
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Question 15 of 98
15. Question
The ideal gas equation is
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Question 16 of 98
16. Question
The number of atoms in one mole of a substance is equal to
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Question 17 of 98
17. Question
The number of electrons in the outermost shell of the atom represents it’s
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Question 18 of 98
18. Question
The number of protons or electrons of an atom represents it’s
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Question 19 of 98
19. Question
The partial pressure of oxygen in a sample of air is 500mmHg. If the total pressure 780 mmHg, what is the mole fraction of the oxygen?
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Question 20 of 98
20. Question
The periodic classification of the elements is an arrangement of the elements in order of their
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Question 21 of 98
21. Question
The process of changing one element into another is called
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Question 22 of 98
22. Question
The shapes of C0,H,O and CH,1 respectively are
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Question 23 of 98
23. Question
This compound exhibits ionic bonding
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Question 24 of 98
24. Question
This type of bonding involves overlapping of orbitals during which electrons are shared
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Question 25 of 98
25. Question
Which one of the following changes is physical?
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Question 26 of 98
26. Question
A side effect of soft water is that
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Question 27 of 98
27. Question
Ammonia is very soluble in water because it is a/an molecule
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Question 28 of 98
28. Question
Citrus fruits such as lemon and grape taste sour because they contain
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Question 29 of 98
29. Question
Soap lather is an example of a colloid in which a
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Question 30 of 98
30. Question
The air around a petroleum refinery is most likely to contain
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Question 31 of 98
31. Question
The difference between colloids and suspensions is brought out clearly by the fact while colloids
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Question 32 of 98
32. Question
The following substances are nonelectrolytes except
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Question 33 of 98
33. Question
The hydrolysis of NH4Cl salt will give
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Question 34 of 98
34. Question
The pollutants that are likely to be presents in an industrial environment are
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Question 35 of 98
35. Question
What is the basicity of tetraoxosulphate (VI) acid?
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Question 36 of 98
36. Question
Which of the following gases is the most dangerous pollutant?
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Question 37 of 98
37. Question
Which of the following ions is a pollutant in drinking water even in trace amount?
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Question 38 of 98
38. Question
Which of the following is an example of a double salt
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Question 39 of 98
39. Question
0.16g of methane when burnt increases the temperature of l00g of water by 40°C, what is the heat of combustion of methane if the heat capacity of water is 4.2Jg-l0C-1? (CH4= 16).
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Question 40 of 98
40. Question
A charge car battery has_________ energy that can be converted into another energy called________Energy
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Question 41 of 98
41. Question
Copper oxide is heated with charcoal to produce carbon monoxide and copper. The reaction is an example of
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Question 42 of 98
42. Question
For each oxygen atom in hydrogen peroxide which acts as an oxidant, there is an oxygen atom which acts as a/an
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Question 43 of 98
43. Question
Given the change of phase: CO2 (g) changes to CO2 (s), the entropy of the system
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Question 44 of 98
44. Question
In which of the following is the entropy change positive?
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Question 45 of 98
45. Question
One of these elements is the best reducing agent
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Question 46 of 98
46. Question
The name of the gas driven off at the negative electrode during the electrolysis of brine is
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Question 47 of 98
47. Question
The oxidation state of P in H2P2O72- is
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Question 48 of 98
48. Question
The oxidation state of S in Ca(HSO3)2 is
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Question 49 of 98
49. Question
The oxidizing agent in the reaction, 3Br2+6OH->BrO3 + 5Bf + 3H20 is
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Question 50 of 98
50. Question
When heat is absorbed during a chemical reaction, the reaction is said to be
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Question 51 of 98
51. Question
Given the reaction at equilibrium: 2CO(g) + 02(g) 2CO2(g) When the reaction is subjected to stress, a change will occur in the concentration of
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Question 52 of 98
52. Question
Given the reaction at equilibrium: N2(g) + O2(g) 2NO(g)as the concentration of N2 (g)increases, the concentration of O2 (g) will
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Question 53 of 98
53. Question
If a reaction is exothermic and there is a great disorder, it means that
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Question 54 of 98
54. Question
In the chemical reaction of A+B C+D, more of D is formed
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Question 55 of 98
55. Question
In what way is equilibrium constant for the forward reaction related to that of the reverse reaction?
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Question 56 of 98
56. Question
In which reaction will the point of equilibrium shift to the left when the pressure on the system is increased?.
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Question 57 of 98
57. Question
The furring of kettles is caused by the presence in water of
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Question 58 of 98
58. Question
Which is a property of a reaction that has reached equilibrium?
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Question 59 of 98
59. Question
Which of the following combination of conditions many increase the rate of a chemical reaction
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Question 60 of 98
60. Question
“Quicklime” has the formula
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Question 61 of 98
61. Question
A Transition metal is different from a non- transition metal because
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Question 62 of 98
62. Question
Chlorine is produced commercially by
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Question 63 of 98
63. Question
Chlorine, bromine and iodine resemble one another since they
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Question 64 of 98
64. Question
Liquid oxygen may be produced by condensation of air using this coolant
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Question 65 of 98
65. Question
One of these is another form of oxygen
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Question 66 of 98
66. Question
One of these metals is not an alkali metal
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Question 67 of 98
67. Question
One of these reactions represents the laboratory preparation of hydrogen.
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Question 68 of 98
68. Question
The formation of ozone by reaction of 02 ‘V with atomic oxygen in UV light occurs in
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Question 69 of 98
69. Question
The halogen which is chiefly produced commercially from sea water is
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Question 70 of 98
70. Question
The most stable allotropic form of sulpur at nonnal conditions is
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Question 71 of 98
71. Question
The products obtained when the following chemical reaction is completed and balanced are HNO3 + Ca(OH)2 —
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Question 72 of 98
72. Question
What is the role of iron and Aluminum oxide in ammonia product?
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Question 73 of 98
73. Question
When carbon IV oxide is bubbled through lime water, the solution becomes milky due formation of
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Question 74 of 98
74. Question
Which of the following gases dissolves in Water vapour to produce acid rain during rainfall?
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Question 75 of 98
75. Question
Which of the following is not allotrope of carbon?
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Question 76 of 98
76. Question
Which oxide is amphiprotic (amphoteric)?
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Question 77 of 98
77. Question
Why will it always be more difficult to extract potassium ions from sea water than to extract magnesium ions? This is because
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Question 78 of 98
78. Question
SO can be used to test for reducing sugars:
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Question 79 of 98
79. Question
2CH3COOH +Zn-V? The product of this reaction is:
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Question 80 of 98
80. Question
A ketone reacts with hydroxylamine to give
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Question 81 of 98
81. Question
Alkanoic acids are weak acids and ionizes in solution to give:
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Question 82 of 98
82. Question
An excess of ethanol heated with concentrated H2SO4 at a temperature of I 180°C is dehydrated to give mostly:
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Question 83 of 98
83. Question
Butene can be distinguished from benzene by reaction with:
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Question 84 of 98
84. Question
Detergent is more efficient than soap in cleansing clothes and dishes because of the following reasons except that:
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Question 85 of 98
85. Question
In the manufacture of soap industrially, brine is used to the acid salt
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Question 86 of 98
86. Question
Methane gas can be made from carbon (II) oxide gas according to the equation
2CO(g) + 2H2(g)- CH4(g) + CO2(g).
Calculate the mass of CO required to produce 8.75 x l025 molecules of CH4? (At masses: C=12.011, H = 1.008,0 = 15.999, Avogrado’s no: 6.022x 10m23 molccules/mole.)
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Question 87 of 98
87. Question
Potassium ethanoate is formed when:
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Question 88 of 98
88. Question
Saponification is defined as:
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Question 89 of 98
89. Question
Soaps and detergents have the same basic characteristics except that carboxyl group of the fatty acid in detergent is replaced by
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Question 90 of 98
90. Question
The relatively high boiling point of alkanols is due to
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Question 91 of 98
91. Question
Two important sources of detergent are:
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Question 92 of 98
92. Question
What is the process associated with conversion of vegetable oil to soap?
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Question 93 of 98
93. Question
When ethanol vapour is passed over manganese (II) ethanoate (manganese acetate) catalyst in the presence of air, the product is:
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Question 94 of 98
94. Question
When KOH is used instead of NaOH in the production of saop, it has the following advantages except it gives:
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Question 95 of 98
95. Question
When palm wine is left exposed to air for a few days, it goes sour. The bacteria in the air oxidizes in palm wine to
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Question 96 of 98
96. Question
Which of the following is not true about benzoic acid?
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Question 97 of 98
97. Question
Which of the following reactions is correct?
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Question 98 of 98
98. Question
Which of these is not a property of ethanedioic acid?
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