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Question 1 of 125
1. Question
Each 325mg tablet of aspirin consists of 195.0mg carbon, 14.6mg hydrogen and 115.4mg oxygen. Determine its empirical formula (C=12, H=l, 0=16).
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Question 2 of 125
2. Question
Identify the number of reacting units in the reaction. Cr2072 + 6H —> 2Cr3+ + 7H20
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Question 3 of 125
3. Question
Zinc oxide is a
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Question 4 of 125
4. Question
The periodic classification of elements is an arrangement of the elements in order of their
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Question 5 of 125
5. Question
A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, 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 6 of 125
6. Question
A volume of 42.5ml O.125M KOH is needed to neutralize completely 37.2ml of H3P04 solution. Find the molar concentration of H3P04.
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Question 7 of 125
7. Question
The number of dissolved particles in solution does not depend on one of the following
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Question 8 of 125
8. Question
For a 0.262m solution of maltose in water, calculate the freezing point of the solution. Kf = 1.855°C; Kb =0.512°Cm-1
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Question 9 of 125
9. Question
For a 0.222m solution of sucrose in water, calculate the boiling of the solution: Kb = O.512°Cm-1 Kf = 1.855°C-1
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Question 10 of 125
10. Question
An element X forms the following compounds with chlorine XCl4, XCl3, XCl2. This illustrates
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Question 11 of 125
11. Question
When air which contains the gases oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;
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Question 12 of 125
12. Question
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known’ as
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Question 13 of 125
13. Question
When each of the nitrates of potassium, magnesium and iron is heated,
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Question 14 of 125
14. Question
Consider the reaction represented by the equation
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Question 15 of 125
15. Question
A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate.
The total hardness may therefore be removed by
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Question 16 of 125
16. Question
A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate.
The total hardness may therefore be removed by
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Question 17 of 125
17. Question
Detergents have the general formula
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Question 18 of 125
18. Question
The formula of the compound formed in a reaction between a trivalent metal M and a tetravalent non metal X is
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Question 19 of 125
19. Question
2.25g of a sample of an oxide of copper on reduction gave 2.Og of copper. 2.50g of another oxide of copper on reduction also gave 2.Og of copper. These results are in accordance with the law of ______
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Question 20 of 125
20. Question
One mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. What is the volume of the product at s.t.p?
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Question 21 of 125
21. Question
The rate of a reaction is proportional to the number of effective collisions occurring per seconds within the reactants. This statement is associated with the
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Question 22 of 125
22. Question
A zero order reaction is one
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Question 23 of 125
23. Question
Which of the following physical properties decreases across the periodic table?
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Question 24 of 125
24. Question
What are the possible oxidation numbers for an element if its atomic number is 17?
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Question 25 of 125
25. Question
The energy change accompanying the addition of an electron to a gaseous atom is called?
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Question 26 of 125
26. Question
The reaction between an organic acid and an alcohol in the presence of an acid catalysts known as
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Question 27 of 125
27. Question
If 30cm3 of oxygen diffuses through a porouspot in 7 seconds, how long will it take 60cm3 of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?
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Question 28 of 125
28. Question
The electronic configuration of the specie underlined as in the molecule is
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Question 29 of 125
29. Question
The functional group(s) of an amino acid is/are ________
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Question 30 of 125
30. Question
A student while trying to identify two gases labeled A and B, found that gas A is acidic to litmus paper and turn acidified potassium dichromate solution green, while gas B turns red litmus paper blue and forms dense white fume with hydrogen chloride. The correct identity of A and B respectively are
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Question 31 of 125
31. Question
Which of the following titrations will have a solution with a pH greater than 7 at the end point (equivalence point) of the titration?
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Question 32 of 125
32. Question
9.0dm3 of a gas at s.t.p. was subjected by means of a movable piston to two times the original pressure witn me temperature being now at 364K. What is the volume of the gas in dm3 at this pressure?
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Question 33 of 125
33. Question
An increase in the temperature causes an increase in the pressure of a gas because there is an increase in the
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Question 34 of 125
34. Question
The forces holding naphthalene crystals together can be overcome when naphthalene is heated to a temperature of 354K resulting in the crystals meltiig. These forces are known as _____
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Question 35 of 125
35. Question
A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?
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Question 36 of 125
36. Question
The dependence of rate reaction on temperature is given k by
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Question 37 of 125
37. Question
Which of the following gases may not be dried with concentrated sulphuric acid?
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Question 38 of 125
38. Question
Metal salts of long chain fatty acids are known as
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Question 39 of 125
39. Question
Cellulose and starch can be classified as one of the following:
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Question 40 of 125
40. Question
Which of the following in NOT a redox reaction?
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Question 41 of 125
41. Question
Which of the following processes leads to increase in entropy?
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Question 42 of 125
42. Question
Which of the following statements is true?
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Question 43 of 125
43. Question
A liquid begins to boil when
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Question 44 of 125
44. Question
An element which exists in more than crystalline form is said to exhibit
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Question 45 of 125
45. Question
A mixture of starch solution and potassium oxide was placed in a test tube. On adding dilute tetraoxosulphate (VI) acid then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the
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Question 46 of 125
46. Question
Which of the following statements is true?
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Question 47 of 125
47. Question
Which property of a reversible reaction is affected by a catalyst?
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Question 48 of 125
48. Question
Which of the following is used in fire extinguishers?
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Question 49 of 125
49. Question
When H2S gas is passed into a solution of iron (iii) chloride, the colour changes from yellow to green. This is because
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Question 50 of 125
50. Question
Suitable reagents for the laboratory preparation of nitrogen are
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Question 51 of 125
51. Question
The thermal decomposition of copper (II) trioxonitrate (V) yields copper (II) oxide, oxygen and
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Question 52 of 125
52. Question
Which of the following is an example of a chemical change?
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Question 53 of 125
53. Question
The electronic configuration in the ground state of the chloride ion (Cl) is
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Question 54 of 125
54. Question
Which of the following is not a member of the homologous series of paraffins (alkanes)?
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Question 55 of 125
55. Question
Which of the following statement is an exception in the assumptions of the kinetic theory of gases?
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Question 56 of 125
56. Question
An example of alcohol is
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Question 57 of 125
57. Question
Hypochlorous acid is used as a bleach because
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Question 58 of 125
58. Question
Which of the following compounds will form a solution if exposed to air?
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Question 59 of 125
59. Question
Consider the following exothermic reaction
2SO2(g)+ O2(g) 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, and no other change takes place, then
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Question 60 of 125
60. Question
Alkanoates are formed by the reaction of alkanoic acid with
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Question 61 of 125
61. Question
Methylethanoate reacts with ammonia to yield _____
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Question 62 of 125
62. Question
Crude copper can be purified by the electrolysis of CuSO4 if
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Question 63 of 125
63. Question
Aluminium is extracted commercially from its ore by
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Question 64 of 125
64. Question
Which of the following is used in the manufacture of glass?
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Question 65 of 125
65. Question
Chlorine is produced commercially by
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Question 66 of 125
66. Question
Three solutions contain carbonate, sulphate and suiphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of
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Question 67 of 125
67. Question
The following equation H2O + 2Fe2+ + Cl2 2Fe3 + +2C1 + H2O. The only ion which behaves as an oxidizing agent is
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Question 68 of 125
68. Question
Which of the following changes is physical?
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Question 69 of 125
69. Question
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the beaker
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Question 70 of 125
70. Question
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.
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Question 71 of 125
71. Question
200cm3 each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated. [Pb = 207, Cl= 35, N 14, 0 = 16]
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Question 72 of 125
72. Question
Which of the following gases will diffuse fastest when passed through a porous plug?
[H=1,C=12,N=14,Q=16]
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Question 73 of 125
73. Question
Which of the following will have its mass increased when heated with air?
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Question 74 of 125
74. Question
A gaseous metallic chloride MClx , consists of 20.22% of M by mass. [The formula of the chloride is = 27, Cl 35.5]
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Question 75 of 125
75. Question
In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMo1-1 of energy is required. This energy is referred to as
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Question 76 of 125
76. Question
The method that can be used to convert hard water to soft water is
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Question 77 of 125
77. Question
Given that electronegativity increases across, a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?
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Question 78 of 125
78. Question
The correct order of increasing oxidation number of the transition metal ions for the compounds K2Cr2O, V2O5 and KMnO4 is
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Question 79 of 125
79. Question
What is observed when aqeous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?
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Question 80 of 125
80. Question
The solubility product of Cu(103)2 is 1,08 x 10-7. Assuming that neither ions react appreciably with water to form H+ and OH–, what is the solubility of the salt?
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Question 81 of 125
81. Question
In the chemical reaction above, the substance that will increase the rate of production of of sulphur (VI) oxide is
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Question 82 of 125
82. Question
What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution? [F 96 500 C mol]
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Question 83 of 125
83. Question
When a current I was passed through an electrolyte solution for 40 minutes, a mass Xg of a univalent metal was deposited at the cathode. What mass of the metal will be deposited when a current 21 is passed through the solution for 10 minutes?
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Question 84 of 125
84. Question
Which of the following statements is true, of the electro chemical series’?
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Question 85 of 125
85. Question
Chlorine, Bromine and Iodine resemble one another in the way they
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Question 86 of 125
86. Question
A pair of compounds that can be used to generate a gas which has physiological effect on human beings is
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Question 87 of 125
87. Question
What properties of Duralumin makes it more useful than its constituent metals?
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Question 88 of 125
88. Question
A metal that can be extracted from cassitertite is
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Question 89 of 125
89. Question
The hydrocarbon that bums in air with a sooty flame is
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Question 90 of 125
90. Question
Which of the following is a solvent for perfumes?
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Question 91 of 125
91. Question
An eruption polluted an environment with a gas suspected to be H2S, a poisonous gas. A rescue team should spray the environment with
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Question 92 of 125
92. Question
1.34 of hydrated sodium tetraoxosulphate (vi) was heated to given an anhydrous salt weighing 0.71g. The formula of the hydrated salt is ______ (Na =23, S= 32, O = 16 H=1)
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Question 93 of 125
93. Question
The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is
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Question 94 of 125
94. Question
A substance S is isomorphous with another substance R. When a tiny crystal of S is added into a supersaturated solution of R
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Question 95 of 125
95. Question
Which of the following dilute solutions has the lowest Ph value?
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Question 96 of 125
96. Question
Which of the following is a basic salt?
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Question 97 of 125
97. Question
Which of the following is neutral to litmus paper?
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Question 98 of 125
98. Question
Bronze is an alloy of
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Question 99 of 125
99. Question
Polyvinyl chloride is used to produce
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Question 100 of 125
100. Question
When two end alkyl groups of ethyl ethanoate are interchanged, the compound formed is known as
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Question 101 of 125
101. Question
Phosphorus is stored under water to prevent it from
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Question 102 of 125
102. Question
The chemical used for coagulating in water purification is
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Question 103 of 125
103. Question
What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of air?
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Question 104 of 125
104. Question
Deliquescent substance are used for
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Question 105 of 125
105. Question
Which of the following statements is correct about the average kinetic energy of the molecules of a gas?
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Question 106 of 125
106. Question
Four elements W, X, Y and Z have atomic number 2, 6, 16 and 20 respectively. Which of these elements is a metal?
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Question 107 of 125
107. Question
An oxide XO2 has a vapour density of 32. What is the atomic mass of X?
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Question 108 of 125
108. Question
A particle that contains 9 protons, 10 neutrons and 10 electrons is a
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Question 109 of 125
109. Question
25cm3 of a gas X contains Z molecules at 15°C and 75mmHg. How many molecules will 25cm3 of another gas contain at the same temperature and pressure?
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Question 110 of 125
110. Question
Alkanones are generally obtained by the oxidation of
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Question 111 of 125
111. Question
The chlorinated alkane often used industrially to remove grease is
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Question 112 of 125
112. Question
Unsaturated organic compounds are identified by decolourization of
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Question 113 of 125
113. Question
The least easily oxidized of the metals below is
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Question 114 of 125
114. Question
A common characteristics of copper and silver in their usage as coinage metals is that they
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Question 115 of 125
115. Question
Synthesis gas a mixture of
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Question 116 of 125
116. Question
The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence in them of
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Question 117 of 125
117. Question
The substance often used for vulcanization of rubber is
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Question 118 of 125
118. Question
For a reaction in equilibrium, the species involved in the equilibrium constant expression are
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Question 119 of 125
119. Question
Powdered marble reacts faster with hydrochloric acid solution than the granular form because the powdered form has
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Question 120 of 125
120. Question
Given that M is the mass of substance deposited in an electrolysis and Q the quantity of electricity consumed, then Faraday’s law can be written as
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Question 121 of 125
121. Question
Y in the equation above represents
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Question 122 of 125
122. Question
In which order are the following salts sensitive to light?
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Question 123 of 125
123. Question
Hydration of ions solutions is associated with
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Question 124 of 125
124. Question
The air pollutant unknown in nature is
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Question 125 of 125
125. Question
A side effect of soft water is that
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