POST UTME REDEEMERS UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 2
The element with atomic number 12 is _______.
A. Magnesium
B. Silicon
C. Germanium
D. Tin
Question 3
A 0.1 M solution of H2SO4 is mixed with a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 4
In the electrolysis of water, what is the primary product at the cathode?
A. Oxygen gas
B. Hydrogen gas
C. Water
D. Hydrogen peroxide
Question 5
What is the major environmental impact of the use of chlorofluorocarbons (CFCs)?
A. Ozone depletion
B. Global warming
C. Acid rain
D. Air pollution
Question 6
What is the major difference between the periodic table of elements and the periodic table of organic compounds?
A. The periodic table of elements is arranged by atomic number, while the periodic table of organic compounds is arranged by molecular weight.
B. The periodic table of elements is arranged by atomic number, while the periodic table of organic compounds is arranged by functional group.
C. The periodic table of elements is arranged by atomic number, while the periodic table of organic compounds is arranged by molecular formula.
D. The periodic table of elements is arranged by molecular weight, while the periodic table of organic compounds is arranged by atomic number.
Question 7
The diagram below shows a titration setup. What is the purpose of the burette?
A. to measure the volume of the titrant
B. to measure the volume of the analyte
C. to mix the titrant and analyte
D. to separate the titrant and analyte
Question 8
What is the primary mechanism of action of the ha\logen atom in the reaction with the alkane?
A. Electrophilic addition
B. Nucleophilic substitution
C. Free radical substitution
D. Electrophilic substitution
Question 9
A 2.5 M solution of HCl is titrated with 0.5 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added. The initial volume of HCl is 50 mL.
A. 1.3
B. 1.4
C. 1.5
D. 1.6
Question 10
A 25.0 mL sample of 0.500 M NaOH is mixed with 25.0 mL of 0.500 M HCl. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 11
A 10 M solution of H2SO4 is titrated with 1 M NaOH. Calculate the pH of the solution after 20 mL of NaOH has been added. The initial volume of H2SO4 is 50 mL.
A. 1.2
B. 1.3
C. 1.4
D. 1.5
Question 12
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cyclohexene
D. cyclohexanol
Question 13
Determine the number of moles of oxygen gas (O2) required to completely combust 2.50 g of propane (C3H8) according to the balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O.
A. 0.125 mol
B. 0.250 mol
C. 0.500 mol
D. 1.00 mol
Question 14
A 2.50 g sample of a metal carbonate is heated to produce a 0.75 g sample of the metal oxide. What is the percentage yield of the metal oxide?
A. 30%
B. 40%
C. 50%
D. 60%
Question 15
A metal (M) reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2M2O3. If 2.50 g of M is heated in air, what is the mass of M2O3 formed?
A. 5.00 g
B. 6.25 g
C. 7.50 g
D. 8.75 g

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