Prepare for success in JAMB with 2011 Chemistry past questions and answers. Access free practice tests, review key topics, and boost your exam readiness today.
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What is the concentration of a solution containing 2g of NaOH in 100 cm3 of solution? [Na = 23, O = 16, H = 1]
0.30 mol dm−3
0.50 mol dm−3
0.40 mol dm−3
0.05 mol dm−3
Which of the following properties is NOT peculiar to matter?
Kinetic energy of particles increases from solid to gas
Random motion of particles increases from liquid to gas
Random motion of particles increases from gas to solid
Orderliness of particles increases from gas to liquid
The principle of column chromatography is based on the ability of the constituents to
react with the solvent in the column
move at different speeds in the column
react with each other in the column
dissolve in each other in the column
From the diagram above an ideal gas can be represented by
L
K
N
M
Which of the following statements about the periodic table is correct?
Elements in the same period have the same number of valence electrons
Elements in the same group have the same number of electron shells
The non‑metallic properties of the elements tend to decrease across each period
The number of valence electrons increases progressively across a period
The relative atomic mass of naturally occurring lithium consisting of 90% 7Li and 10% 6Li is
6.2
6.9
6.8
7.1
An isotope has atomic number 15 and mass number 31. The number of protons it contains is
16
31
46
15
The molecular lattice of iodine is held together by
van der Waals forces
hydrogen bonds
dative bonds
metallic bonds
The arrangement of particles in crystal lattices can be studied using
β-rays
X‑rays
α-rays
γ-rays
From the diagram above, find the amount of solute deposited when 200 cm3 of the solution is cooled from 55 °C to 40 °C.
0.01 mol
0.02 mol
0.10 mol
0.20 mol
The importance of sodium aluminate (III) in the treatment of water is to
cause coagulation
prevent goitre and tooth decay
neutralize acidity
kill germs
What type of bond exists between an element X with atomic number 12 and Y with atomic number 17?
Dative
Covalent
Metallic
Electrovalent (ionic)
Hardness of water is mainly due to the presence of
calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
sodium hydroxide or magnesium hydroxide
calcium hydroxide or magnesium hydroxide
calcium chloride or sodium chloride salts
A suitable solvent for iodine and naphthalene is
water
carbon(IV) sulphide (CS2)
benzene
ethanol
Which of the following noble gases is commonly found in the atmosphere?
Neon
Xenon
Argon
Helium
\(\ce{N2O4(g) <=> 2 NO2(g)}\) \(\Delta H = +ve\). In the reaction above, an increase in temperature will
increase the value of the equilibrium constant
shift the equilibrium to the left
decrease the value of the equilibrium constant
increase the proportion of reactants
\(\text{CH}_3\text{COOH}_{(aq)} + \text{OH}^-_{(aq)} \; \rightleftharpoons \; \text{CH}_3\text{COO}^-_{(aq)} + \text{H}_2\text{O}_{(l)}\)
In the reaction above, \(\ce{CH3COO^-_{(aq)}}\) is
conjugate base
acid
base
conjugate acid
How many cations will be produced from a solution of potassium aluminium tetraoxosulphate (VI)?
3
4
1
2
Which of the following is NOT an alkali?
NH3
Mg(OH)2
Ca(OH)2
NaOH
An effect of thermal pollution on water bodies is that the
volume of water reduces
volume of chemical waste increase
level of oxides of nitrogen increase
level of oxygen reduces
Which of the following is a deliquescent compound?
CaCl2
Na2CO3
CuO
Na2CO3·10H2O
A chemical reaction which the hydration energy is greater than the lattice energy is referred to as
a spontaneous reaction
an endothermic reaction
an exothermic reaction
a reversible reaction
The function of zinc electrode in a galvanic cell is that it
undergoes reduction
serves as the positive electrode
production electrons
uses up electrons
\(\mathrm{CH_4(g) + Cl_2(g) \rightarrow CH_3Cl_{(s)} + HCl_{(g)}}\)
The major factor that influence the rate of the reaction above is
catalyst
temperature
concentration
light
The condition required for corrosion to take place is the presence of
water and carbon (IV) oxide
water, carbon (IV) oxide and oxygen
oxygen and carbon (IV) oxide
water and oxygen
In the diagram above, X is the
enthalpy
enthalpy change
activation energy
activated complex
The diagram above best illustrates the effect of decrease in
concentration
temperature
surface area
pressure
\(\ce{MnO4^- (aq) + Y + 5Fe^2+ (aq) -> Mn^2+ (aq) + 5Fe^2+ (aq) + 4H2O (l)}\)
In the equation above, Y is:
\(5\mathrm{H^+}_{(aq)}\)
\(4\mathrm{H^+}_{(aq)}\)
\(10\mathrm{H^+}_{(aq)}\)
\(8\mathrm{H^+}_{(aq)}\)
Given that M is the mass of a substance deposited during electrolysis and Q is the quantity of electricity consumed, then Faraday's first law can be written as [Electrochemical equivalent]
\(M = \dfrac{E}{Q}\)
\(M = EQ\)
\(M = \dfrac{Q}{E}\)
\(M = \dfrac{E}{2Q}\)
The impurities formed during the laboratory preparation of chlorine gas are removed by
H2O
NH3
H2SO4
HCI
The effect of the presence of impurities such as carbon and sulphur on iron is that they
give it high tensile strength
make it malleable and ductile
increase its melting point
lower its melting point
A few drops of concentrated HNO3 is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation presents are likely to be
Pb2+
Cu2+
Fe3+
Fe2+
The bleaching action of chlorine gas is effective due to the presence of
hydrogen chloride
water
air
oxygen
In the laboratory preparation of oxygen, dried oxygen is usually collected over
hydrochloric acid
mercury
calcium chloride
tetraoxosulphate (VI) acid
The property of concentrated H2SO4 that makes it suitable for preparing HNO3 is its
boiling point
density
oxidizing properties
dehydrating properties
Bronze is preferred to copper in the making of medals because it
is stronger
can withstand low temperature
is lighter
has low tensile strength
The constituents of baking powder that makes the dough to rise is
NaHCO3
NaOH
Na2CO3
NaCl
Which of the following compound is used as a gaseous fuel?
CH3–C=CH
CH3–CH2 –CH3
|
OH
CH3–CH2–CH2–COOH
CH3-CH2–CH2–CH3
The ability of carbon to form long chains is referred to as
alkylation
acylation
catenation
carbonation
Which of the following compounds will undergo polymerization reaction?
C2H4
C2H5COOH
C2H6
C2H5OH
The compound above exhibits
geometric isomerism
optical isomerism
structural isomerism
positional isomerism
An organic compound has an empirical formula CH2O and vapour density of 45. What is the molecular formula? [C = 12, H = 1, O = 16]
C3H7OH
C2H5OH
C3H6O3
C2H4O2
C6H12O6 → 2C2H5OH + 2CO2 + energy 25 °C. The reaction above represented by the equation above is useful in the production of
propanol
butanol
methanol
ethanol
The number of isomers that can be obtained from C4H10 is
3
4
1
2
The functional groups present in the compound above are
alkene and halo-group
hydroxyl and chloro-group
alkene and chloro-group
hydroxyl and halo-group
Which of the following is a primary amine?
A
B
C
D
Two organic compounds K and L were treated with a few drops of Fehling's solutions respectively. K formed a brick red precipitate while L, remains unaffected. The compound K is an
alkanol
alkane
alkanal
alkanone
Which of the following statements is true about 2- methylpropane and butane
They are members of the same homologous series
They have the same boiling point
They have different number of carbon atoms
They have the same chemical properties
CH3COOH + C2H5OH → CH3COOC2H5 + H2O (conc. H2SO4)
The reaction above is best described as
esterification
Condensation
saponification
neutralization
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