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Chemistry
UTME / JAMB 2013
Air & Environmental Chemistry
In a water body, too much sewage leads to
A
a decrease in the temperature of the water which cause in death of aquatic animals
B
an increase in the number of aquatic animals in the water
C
an increase in the bacterial 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
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #27440)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
10.0 dm3 of water was added to 2.0 mol dm-3 of 2.5dm3 solution of HCl. What is the concentration of the final solution in mol dm-3?
A
0.4
B
8.0
C
2.0
D
0.5
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
C1V1 = C2V2
C2 = \(\frac{C_1V_1}{V_2}\)
= \(\frac{2.0 \times 2.5}{12.5}\)
= 0.4mol/dm-3
Source: Myschool Past Questions Archive (Record #27441)
Chemistry
UTME / JAMB 2013
Acids, Bases, pH & Salts
Three drops of a 1.0 mol dm-3 solution of HCl was added to 20 cm3 of a solution of pH6.4. The pH of the resulting solution will be
A
close to that of pure water
B
less than 6.4
C
greater than 6.4
D
unaltered
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27442)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following substances is not a salt?
A
Aluminium oxide
B
Sodium hydrogentrioxosulphate (V)
C
Sodium trioxocarbonate (V)
D
Zinc chloride
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #27443)
Chemistry
UTME / JAMB 2013
Acids, Bases, pH & Salts
An insoluble salt can be prepared by
A
the reaction of trioxocarbonate (V) with an acid
B
double decomposition
C
the action of dilute acid on an insoluble base
D
the reaction of metals with an acid
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27444)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
2H2O (l) + 2F2(g) → 4HF(aq) + O2(g).
In the reaction above, the substance that is being reduced is
A
O2(g)
B
H2O(l)
C
F2(g)
D
HF(aq)
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
F(2) + 2e \(\rightarrow\) 2F- x 2
2F2 + 4e \(\rightarrow\) 4F-
Source: Myschool Past Questions Archive (Record #27445)
Chemistry
UTME / JAMB 2013
Electrolysis & Electrochemical Cells
In an electrochemical cell, polarization is caused by
A
chlorine
B
oxygen
C
tetaoxsulphate (Vl) acid
D
hydrogen
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #27446)
Chemistry
UTME / JAMB 2013
Chemical Energetics & Thermochemistry
In an endothermic reaction, if there is a loss in entropy the reaction will
A
be indeterminate
B
be spontaneous
C
not be spontaneous
D
be at equilibrium
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #27448)
Chemistry
UTME / JAMB 2013
Periodic Table & Periodicity
the minimum amount of energy required for a reaction to take place is
A
lattice energy
B
ionization energy
C
activation energy
D
kinetic energy
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #27449)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following compounds is a neutral oxide?
A
Carbon (IV) oxide
B
Sulphur (Vl) oixide
C
Sulphur (IV) oxide
D
Carbon (ll) oxide
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #27450)
Chemistry
UTME / JAMB 2013
Non-Metals & Their Compounds
Solution
In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to
A
prevent condensed water from breaking the reaction flask
B
enable the proper mixing of the reactions in the flask
C
enhance the speed of the reaction
D
prevent formation of precipitate
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
During the preparation of ammonia,NH\(_3\) the flask is in slanting position in order to prevent the condensed water formed during the reaction from the reaction flask.
Source: Myschool Past Questions Archive (Record #27451)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the gases is employed as an anaesthesia?
A
N 2O
B
NO2
C
NH3
D
NO
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #27452)
Chemistry
UTME / JAMB 2013
Oxidation, Reduction & Redox Reactions
Sulphur (IV)oxide is a strong reducing agent in the presence of water due to the formation of
A
hydroxide ion
B
sulpgur (Vl)oxide
C
hydrogen sulhide
D
trioxosulphate (IV) salt
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #27453)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
A metal that forms soluble trioxosulphate (IV) ion is
A
barium
B
potassium
C
manganese
D
aluminium
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27454)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
Copper is displaced from the solution of its salts by most metals because it
A
is a transition element
B
is at the bottom of the activity series
C
is very reactive
D
has completely filled 3d-orbitals
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27455)