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CHEMISTRY JAMB CBT 2019
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CHEMISTRY JAMB CBT 2019 TILL DATE
CHEMISTRY JAMB CBT 2019 TILL DATE
1-50 QUESTIONS
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- Answered
- Review
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Question 1 of 122
1. Question
A second alkanol can be oxidized to give an
Get more CBT here
Correct
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With a suitable oxidising agent (such as acidified dichromate
solution, or, acidified permanganate solution), secondary
alkanols (alcohols) can be oxidised to alkanones (ketones).Hint
-
Question 2 of 122
2. Question
Which of the following will give a precipitate with an aqueous
solution of copper (I) chloride?Get more CBT here
Correct
Incorrect
-
Question 3 of 122
3. Question
Correct
Incorrect
Hint
Ethyl propionate is a compound with formula
C2H5(C2H5COO). It is the ethyl ester of propionic acid. It has
a pineapple-like odour. Some fruits such as kiwis and
strawberries contain ethyl propionate in small amounts. More -
Question 4 of 122
4. Question
A certain hydrocarbon on complete combustion at s.t.p
produced 89.6dm of CO and 54g of water. The hydrocarbon
should beGet more CBT here
Correct
Incorrect
-
Question 5 of 122
5. Question
2-methylprop-1-ene is an isomer of
Correct
Incorrect
Hint
But-2-ene exhibits geometric isomerism
-
Question 6 of 122
6. Question
Hydrocarbons which will react with Tollen’s reagent conform to
the general formulaCorrect
Incorrect
-
Question 7 of 122
7. Question
The IUPAC name of the compound CF CHBrCl is
Correct
Incorrect
-
Question 8 of 122
8. Question
Synthetic rubber is obtained from the polymerization of
Correct
Incorrect
Hint
Synthetic rubber, like other polymers, is made from various
petroleum-based monomers. The most prevalent synthetic
rubber is styrene-butadiene rubbers (SBR) derived from then 2n−2
copolymerization of styrene and 1,3-butadiene.
Other synthetic rubbers include: polyisoprene, prepared
by polymerization of synthetic isoprene. -
Question 9 of 122
9. Question
Burning magnesium ribbon in air removes which of the
following
(i) oxygen (ii) nitrogen (iii) argon and (iv) carbon(iv)oxide?Correct
Incorrect
Hint
Burning magnesium ribbon in air removes oxygen
-
Question 10 of 122
10. Question
Which of the following is the best starting material for the
preparation of oxygen? Heating of trioxonitrate (v) withCorrect
Incorrect
Hint
Pb is headed with trioxonitrate (v) to prepare oxygen
-
Question 11 of 122
11. Question
Which of the following metals is the most essential in the
regulation of blood volume, blood pressure and osmotic
equilibrium?Correct
Incorrect
-
Question 12 of 122
12. Question
Which of the following alkaline metals react more quickly
spontaneously with water?Correct
Incorrect
-
Question 13 of 122
13. Question
When chlorine water is exposed to bright sunlight, the following
products are formedCorrect
Incorrect
-
Question 14 of 122
14. Question
Which process(es) is/are involved in the turning of starch
iodide paper blue-black by chlorine gas?Correct
Incorrect
Hint
The oxidization of iodide (by chlorine) ion produces the iodine
which attacks the starch to give the blue-black colour -
Question 15 of 122
15. Question
Which of the following is a set of neutral oxides?
Correct
Incorrect
-
Question 16 of 122
16. Question
SO is not directly dissolved in water in the industrial
preparation of H SO by the contact process becauseCorrect
Incorrect
-
Question 17 of 122
17. Question
Which of the following statements does not show Rutherford’s
account of Nuclear Theory? An atom contains a regionCorrect
Incorrect
-
Question 18 of 122
18. Question
Elements X and Y have electronic configurations 1s2 2s2 2p4
and 1s2 2s2 2p63s2 3p1 respectively. When they combine, the
formula of the compound formed isCorrect
Incorrect
-
Question 19 of 122
19. Question
By what amount must the temperature of 200cm of Nitrogen
at 27°C be increased to double the pressure if the final volume
is 150cm (Assume ideality)Correct
Incorrect
-
Question 20 of 122
20. Question
The combustion of carbon(ii)oxide in oxygen can be
represented by equation.
2CO + O2 → 2CO2
Calculate the volume of the resulting mixture at the end of the
reaction if 50cm of carbon(ii)oxide was exploded in 100cm of
oxygenCorrect
Incorrect
-
Question 21 of 122
21. Question
When ammonia and hydrogen ion bond together to form
ammonium ion, the bond formed is calledCorrect
Incorrect
Hint
When ammonia and hydrogen ion go into bonding, they form
ammonium ion by combining with a dative/coordinate covalent
bond. -
Question 22 of 122
22. Question
Which of the following represents the kind of bonding present
in ammonium chloride?Correct
Incorrect
-
Question 23 of 122
23. Question
Consider the reaction
A(s) + 2B(g) → 2C(aq) + D(g)
What will be the effect of a decrease in pressure on the
reaction?Correct
Incorrect
-
Question 24 of 122
24. Question
Which of the following reactions is an oxidation process?
Correct
Incorrect
-
Question 25 of 122
25. Question
If acidified Potassium Dichromate(VI) (K Cr O ) acts as
oxidizing agent, color changes fromCorrect
Incorrect
-
Question 26 of 122
26. Question
The heat of formation of ethene, C H is 50 kJmol , and that
of ethane, C H is -82kJmol . Calculate the heat evolved in
the process:C 2H4 + H2 —> C2 H6
Correct
Incorrect
-
Question 27 of 122
27. Question
Which of the following statements about catalyst is false?
Correct
Incorrect
-
Question 28 of 122
28. Question
Which of the following does not support the fact that air is a
mixture?Correct
Incorrect
-
Question 29 of 122
29. Question
What technique is suitable for separating a binary solution of
potassium chloride and potassium trioxochlorate (V)?Correct
Incorrect
-
Question 30 of 122
30. Question
At 27°C, 58.5g of sodium chloride is present in 250cm of a
solution. The solubility of sodium chloride at this temperature
is?
(molar mass of sodium chloride = 111.0gmol-1 )Correct
Incorrect
-
Question 31 of 122
31. Question
Which of the following properties increases from left to right
along the period but decreases down the group in the Periodic
Table?Correct
Incorrect
-
Question 32 of 122
32. Question
The molecular shape and bond angle of water are respectively
Correct
Incorrect
Hint
The shape of water molecule = Bent/ V- shaped
The bond angle of water = 104.5°/ 105°
-
Question 33 of 122
33. Question
Na 2CO + 2HCl 2NaCl + H 2O + CO2
The indicator most suitable for this reaction should have a pH
equal toCorrect
Incorrect
Hint
Methyl orange is the best indicator for the reaction with range
3.1 – 4.4. -
Question 34 of 122
34. Question
A radioactive nucleus has a half-life of 20 years, starting with
100,000 particles, how many particles will be left exactly at the
end of 40 yearsCorrect
Incorrect
Hint
SOLUTION:
Given:
t1/2 = 20 years
After the first 20 years, half of the substance (
) will have decayed. Hence, we have
100,000 – 50,000 = 50,000 particles left.
After the second 20 years (being 40 years in all), half of the
remaining substance ( ) will have
decayed.Remaining particles after 40 years = 50,000 – 25,000
= 25,000 particles.
-
Question 35 of 122
35. Question
Which two gases can be used for the demonstration of the
fountain experiment?Correct
Incorrect
-
Question 36 of 122
36. Question
Which of the following pollutants will lead to the depletion of
ozone layer?Correct
Incorrect
-
Question 37 of 122
37. Question
Which of the following describes the chemical property of
acids?Correct
Incorrect
-
Question 38 of 122
38. Question
Which of the following pairs cannot be represented with a
chemical formula?Correct
Incorrect
-
Question 39 of 122
39. Question
Which of the following is a physical change?
Correct
Incorrect
-
Question 40 of 122
40. Question
In the reaction between sodium hydroxide and
tetraoxosulphate (VI) solutions, what volume of 0.5 molar
sodium hydroxide would exactly neutralize 10cm of 1.25
molar tetraoxosulphate (vi) acid?Correct
Incorrect
-
Question 41 of 122
41. Question
Sulphur exists in six forms in the solid state. This property is
known asCorrect
Incorrect
-
Question 42 of 122
42. Question
In the reaction:
M + N → P
ΔH = +Q kJWhich of the following would increase the concentration of the
product?Correct
Incorrect
-
Question 43 of 122
43. Question
A compound contains 40.0% carbon, 6.7% hydrogen and
53.3% oxygen. If the molar mass of the compound is 180. Find
the molecular formula.
[H = 1, C = 12, O = 16]Correct
Incorrect
-
Question 44 of 122
44. Question
Which of the following gases contains the least number of
atoms at s.t.p?Correct
Incorrect
Hint
Butane has the least number of atoms, thus:
4 moles of chlorine gas = 4Cl = 8 atoms of chlorine
3 moles of ozone = 3O = 9 atoms of oxygen
1 mole of butane = C H
7 mole of argon = 7Ar = 7 atoms of argon -
Question 45 of 122
45. Question
What mass of magnesium would be obtained by passing a
current of 2 amperes for 2 hours 30 mins, through molten
magnesium chloride?
[1 faraday = 96500C, Mg = 24]Correct
Incorrect
-
Question 46 of 122
46. Question
Which important nitrogen-containing compound is produced in
Haber’s process?Correct
Incorrect
-
Question 47 of 122
47. Question
Elements in the periodic table are arranged in the order of their
Correct
Incorrect
-
Question 48 of 122
48. Question
What volume of 0.100M sodium trioxonitrate (V) solution
contains 5g of solute.
[Na = 23, N = 14, O = 16]Correct
Incorrect
-
Question 49 of 122
49. Question
Correct
Incorrect
Hint
Nicotine is a substance in cigarette which makes
difficult to make one stop smoking. This can be
derived by burning. Options B,C,D will not reduce
this nicotine -
Question 50 of 122
50. Question
Correct
Incorrect
Hint
Crystallization is required the most in industries
where the purity of their products is important e.g in
the manufacture of drugs and in sugar production.
Options B,C and D do not undergo crystallization -
Question 51 of 122
51. Question
Correct
Incorrect
Hint
Iron is galvanized with zinc covering to protect it
against corrosion. Option A, B, D are the main
reasons iron is galvanized -
Question 52 of 122
52. Question
Correct
Incorrect
Hint
Washing under pressure is an action in the industrial
production of H. Options B,C,D will not yield Co
and H -
Question 53 of 122
53. Question
Correct
Incorrect
Hint
Washing under pressure is an action in the industrial
production of H. Options B,C,D will not yield Co
and H -
Question 54 of 122
54. Question
The gas that is most useful in protecting humans
against solar marathon isPlease like our facebook page here
Correct
Incorrect
Hint
The ozone layer or ozone shield refers to a region of
Earth’s stratosphere that absorbs most of the Sun’s
ultraviolet (UV) radiation. It contains high
concentrations of ozone (O3) relative to other parts of
the atmosphere, although still very small relative to
other gases in the stratosphere -
Question 55 of 122
55. Question
Correct
Incorrect
Hint
Vulcanizer is the removal of double bend in a
chemical reaction. Option A,B,D can not be removed
by vulcanizer -
Question 56 of 122
56. Question
Correct
Incorrect
Hint
HeSO4
is the acid used in the electrolysis of water.
Option A,B,D are concentrated acid and they will
react with the water -
Question 57 of 122
57. Question
When salt loses its water of crystallization to the
atmosphere on exposure, the process is said to bePlease like our facebook page here
Correct
Incorrect
Hint
Efflorescence is a process of long exposure to the
atmosphere which favors salt loss of water. Options
B, C, D are not related to loss of water -
Question 58 of 122
58. Question
Correct
Incorrect
Hint
Ozone means Oz as the atomicity is 3. Option A,B,D
cannot give ozone because their atomicity is not 3 -
Question 59 of 122
59. Question
Correct
Incorrect
Hint
Helium has the greatest ionization energy because
they are less stable. Options B,C,D have low
ionization energy because one more stable and do not
react easily -
Question 60 of 122
60. Question
The weakest attractive force that can be observed
between two molecules isPlease like our facebook page here
Correct
Incorrect
Hint
Vander Waals are the weakest attractive forces that
exist between two molecules. Option A,B,C are not
weak forces because the force attraction that exist
between their interested molecule are very strong -
Question 61 of 122
61. Question
Correct
Incorrect
Hint
Sulphur is an element that burns with a strongly
explosive smell, as a result it is explosive smell -
Question 62 of 122
62. Question
Cathode rays cause an object placed behind a
perforated anode to cast a shadow on the screen. This
observation shows that the raysPlease like our facebook page here
Correct
Incorrect
Hint
Rays travels in straight lines and finds its way
through any opening available. It could be refracted,
reflected or transmitted based on any obstacle.
Option A,B,C are not the reason why the cathode are
coasted shadows -
Question 63 of 122
63. Question
Correct
Incorrect
-
Question 64 of 122
64. Question
A suitable reagent for distinguish between
ethanoic and ethanol isPlease like our facebook page here
Correct
Incorrect
Hint
Sodium hydrogen trionocarbonate iv is the only
distinguishing reagent between ethanoic and ethanol.
Option A, B, D are not conspicuous in distinguishing
between ethanoic and ethanol -
Question 65 of 122
65. Question
Correct
Incorrect
Hint
Discharge tube with central cathode is an apparatus
for producing cathode rays and positive rays. Option
A,B,C will not yield cathode rays and positive rays -
Question 66 of 122
66. Question
Correct
Incorrect
Hint
Calcium is the only metal that burn with brick red
flame. Option A,C,D will not burn with brick red
flame rather burn with brick blue flame -
Question 67 of 122
67. Question
In the production of soap, concentrated sodium
chloride solution is added toPlease like our facebook page here
Correct
Incorrect
Hint
Concentrated sodium chloride solution will the
solubility of soap along the course of soap
production. Options A,C,D are not appropriate -
Question 68 of 122
68. Question
Correct
Incorrect
Hint
Kerosene is only liquid that will dissolve fat. Option
A,B,D will not dissolve fat because of their chemical
composition -
Question 69 of 122
69. Question
Correct
Incorrect
Hint
A is the correct answer. Tartaric acid is found in
cream of tartar, which is used in cooking candies and
frostings for cakes. Tartaric acid is also found in
baking powder, where it serves as the source of acid
that reacts with sodium bicarbonate (baking soda) -
Question 70 of 122
70. Question
Correct
Incorrect
Hint
V = 1/P
cross multiply
K = VP
V1P1 = V2V2
For a fixed amount of an ideal gas kept at a fixed
temperature, pressure and volume are inversely
proportional. Or Boyle’s law is a gas law, stating that
the pressure and volume of a gas have an inverse
relationship, when temperature is held constant.
The equations supports only Boyle’s law. Option
A,C,D are not in support of the equation… -
Question 71 of 122
71. Question
A fixed mass of gas a volume of 92cm3
at 3°C.
When will be its volume at 18C if the pressure
remains constant?Please like our facebook page here
Correct
Incorrect
Hint
V1 ÷ T1 = V2 ÷ T2
T1 = 3 × 273 = 276k
T2 = 18 + 273 = 291k
V1 = 92cm3
V2 = ?
V2 = (V1T2) ÷ T1 = (92 × 291) ÷ 276
= 97.0cm3 -
Question 72 of 122
72. Question
Which of the following ion’s requires the
quantity of electricity for discharge at an electrodePlease like our facebook page here
Correct
Incorrect
Hint
2.0 mole of Q3+ ions require the largest quantity of
electricity for discharge at an electric. option B,C,D
are all carrying a smaller quantity of electricity which
not be proven for ant discharge -
Question 73 of 122
73. Question
Correct
Incorrect
Hint
Fe displaces hydrogen from hot alkaline solution.
Options B,C,d will not displace hydrogen -
Question 74 of 122
74. Question
Which of the following types of alkanols
undergo oxidation to produce alkanoic acids.
I. Primary alkanols
II. Secondary alkanols
III. Tertiary alkanolsPlease like our facebook page here
Correct
Incorrect
Hint
Only primary alkanols undergo oxidation to produce
alkanoic acid. Option A,B,C will not produce
alkanoic acid -
Question 75 of 122
75. Question
Correct
Incorrect
Hint
Rare gases are stable because they have duplet or
octet electronic configurations in the outermost shells
in their atoms, as a result they don’t go into solution
easily. option A, B, Dare not because they go into
solution easily (unstable) -
Question 76 of 122
76. Question
Correct
Incorrect
Hint
Coal is a major senses of oxide of nitrogen. Option
B,C, D do not contribute to the anode Nitrogen
either. They are sources of oxides of carbon of
sulphur etc -
Question 77 of 122
77. Question
Correct
Incorrect
-
Question 78 of 122
78. Question
The leachate of a certain ash is used in local soap
because it containPlease like our facebook page here
Correct
Incorrect
-
Question 79 of 122
79. Question
Correct
Incorrect
-
Question 80 of 122
80. Question
Correct
Incorrect
Hint
The oxidation number is from h to O as a result of
release of sulphur. Option B, C, D are not the actual
oxidation number for copper -
Question 81 of 122
81. Question
Correct
Incorrect
Hint
The number of isomers C6H14 cm is 5. it will not
form options A,C, D -
Question 82 of 122
82. Question
There are basic particles from which matter
called be made exceptPlease like our facebook page here
Correct
Incorrect
Hint
Salt is a chemical used for varieties of purposes, so
it’s not part of matter, Atom being the smallest part of
molecule and ion are charge which are part of matter -
Question 83 of 122
83. Question
Correct
Incorrect
Hint
Fractionating column contains petrol with different
densities. -
Question 84 of 122
84. Question
What volume of 0.5mldm3 H2SO4 will exactly neutralize 20cm3 of 0.1moldm3 NaOH Solution?
Please like our facebook page here
Correct
Incorrect
Hint
2NaOH + H2SO4 → Na2SO4 + 2H2O
CaVa) ÷ (CbVb) = ratio of acid / ratio of base
0.5Va ÷ (0.1 × 20) = ½
Va = 2.0cm3 -
Question 85 of 122
85. Question
A compound contains 40.0% carbon, 6.7%
hydrogen and 53.3% oxygen. If the molar mass of the
compound is 180, Find the molecular formula [H = 1, C = 12, O = 16)Please like our facebook page here
Correct
Incorrect
Hint
C = 40%, 40/12 = 3.33
H = 6.7%, 6.7/1 = 6.7
O = 53.3%, 53.3/16 = 3.33
C = 3.33/3.33 = 1
H = 6.7/3.33 = 2
O = 3.33/3.33 = 1
(CH2O)n = 180
(12 + 2 + 16)n = 180
30n = 180
n = 6
= C6H12O6 -
Question 86 of 122
86. Question
Correct
Incorrect
Hint
The oxidation state of K2Cr2O7 is +6. option A,C,D
are the oxidation state of other elements like O7,C14,
etc. -
Question 87 of 122
87. Question
The elements that belong to the third period of
periodic table arePlease like our facebook page here
Correct
Incorrect
Hint
Na, Mg, s and Ar one elements that belong to third
period of the periodic table. Option A,B,C belong to
the other period in the periodic table, second period -
Question 88 of 122
88. Question
Correct
Incorrect
Hint
No entropy change because the sugar will not change
the chemical equivalent of the tea. Options A,B,D are
not appropriate because they will change the
chemical combination of the tea -
Question 89 of 122
89. Question
NH3(g) + HCl(s) → NH 4Cl (s)
The entropy change in the system above is
Please like our facebook page here
Correct
Incorrect
Hint
Entropy s is a measure of the degree of disorder or
randomness of a substance. The entropy charge in the
system is negative. Options B, C, D will not give
negative but the result into positive -
Question 90 of 122
90. Question
Detergents are manufacture with strength
hydrocarbon chains is to make themPlease like our facebook page here
Correct
Incorrect
Hint
Biodegradable because the straight hydrocarbons are
natural and slightly soluble in water. Options A,C,D
do not have strength hydrocarbon chains and they
could harm the environment if they are made with the
detergent -
Question 91 of 122
91. Question
Correct
Incorrect
Hint
Oxide of sulphur is formed as a result of acid rain.
Options A,B, D are not formed as a result of the
pressure of acid -
Question 92 of 122
92. Question
Correct
Incorrect
Hint
Calcium hydrogen trionocarbonate (iv) will cause the
forming of kettles whenever water is present. Options
A, C, D will not react under the presence of water -
Question 93 of 122
93. Question
A difference between chemical and physical
change is that in a chemical changePlease like our facebook page here
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Incorrect
Hint
In chemical change a new substance is formed while
in physical change no new substance is formed.
Options A,B,C are all properties of a physical change -
Question 94 of 122
94. Question
According to the kinetic theory an absence in
temperature causes the kinetic energy of particles toPlease like our facebook page here
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Incorrect
-
Question 95 of 122
95. Question
PCL5(g)= PCL3(g) + Cl2(g)
In the reaction above, a decrease in pressure will
Please like our facebook page here
Correct
Incorrect
-
Question 96 of 122
96. Question
Which of the following gives a precipitation
when treated with NaOH Solution?Please like our facebook page here
Correct
Incorrect
Hint
AlCl3
will give a precipitate when treated with
solution. Option B,C,D will not give a precipitate
when treated with NaOH solution -
Question 97 of 122
97. Question
Correct
Incorrect
Hint
Alloy is a metal that consist of two or more metals
mixed together e.g. is mass which is an alloy of
copper and zinc. Are not prepared with option A,B,C,
and the do not result in mixture and metals together -
Question 98 of 122
98. Question
In countries where the temperature fall below
273k, salt always spilled on the ray road in order toPlease like our facebook page here
Correct
Incorrect
Hint
Salt is good chemical agent that lowers the melting of
an ice only it temperature below 0°C options B,C,D
will not have the melting point except is above the 0°
C. only salt does that. -
Question 99 of 122
99. Question
What is the volume of energy required to burn
45cm3 of mixture at S.T.PPlease like our facebook page here