POST UTME REDEEMERS UNIVERSITY 2018 Chemistry | Objective

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Question 1 View Details
In the electrolysis of water, what is the primary product at the cathode?
A. Oxygen gas
Correct B. Hydrogen gas
C. Water
D. Hydrogen peroxide

Correct Answer: B

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Question 2 View Details
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.
Correct 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.

Correct Answer: B

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Question 3 View Details
What is the primary mechanism of action of the ha\logen atom in the reaction with the alkane?
A. Electrophilic addition
B. Nucleophilic substitution
Correct C. Free radical substitution
D. Electrophilic substitution

Correct Answer: C

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Question 4 View Details
What is the major environmental impact of the use of chlorofluorocarbons (CFCs)?
Correct A. Ozone depletion
B. Global warming
C. Acid rain
D. Air pollution

Correct Answer: A

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Question 5 View Details
What is the primary product of the reaction between the alkene and the hydrogen halide?
Correct A. Alkane
B. Alkene
C. Alkyne
D. Alcohol

Correct Answer: A

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Question 6 View Details
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 7 View Details
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
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 8 View Details
A solution contains 0.10 M NH3 and 0.10 M NH4Cl. What is the pH of the solution?
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 9 View Details
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
Correct D. 4

Correct Answer: D

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Question 10 View Details
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
Correct D. 4

Correct Answer: D

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Question 11 View Details
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?
Correct A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cyclohexene
D. cyclohexanol

Correct Answer: A

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Question 12 View Details
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%
Correct B. 40%
C. 50%
D. 60%

Correct Answer: B

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Question 13 View Details
The diagram below shows a titration setup. What is the purpose of the burette?
Correct 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

Correct Answer: A

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Question 14 View Details
The rate cons\tant (k) for a first-order reaction is 0.025 min^-1. What is the half-life of the reaction?
Correct A. 28 min
B. 42 min
C. 56 min
D. 70 min

Correct Answer: A

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Question 15 View Details
The diagram below shows a chemical apparatus setup. What is the purpose of the condenser?
Correct A. to cool the vapor
B. to heat the vapor
C. to separate the vapor and liquid
D. to mix the vapor and liquid

Correct Answer: A

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Question 16 View Details
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, ΔHf(C(s)) = 0 kJ/mol. Assume the reaction is: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1207.6 kJ/mol
B. -1208.6 kJ/mol
C. -1209.6 kJ/mol
D. -1210.6 kJ/mol

Correct Answer: A

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Question 17 View Details
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
Correct C. 1.5
D. 1.6

Correct Answer: C

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Question 18 View Details
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is initially present, how much will remain after 15 years?
A. 25 g
Correct B. 50 g
C. 75 g
D. 100 g

Correct Answer: B

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Question 19 View Details
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 298 K. Calculate the number of moles of nitrogen gas present.
A. 0.1 mol
Correct B. 0.2 mol
C. 0.3 mol
D. 0.4 mol

Correct Answer: B

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Question 20 View Details
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
Correct C. 1.4
D. 1.5

Correct Answer: C

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Question 21 View Details
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
Correct B. 0.250 mol
C. 0.500 mol
D. 1.00 mol

Correct Answer: B

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Question 22 View Details
A 25.0 mL sample of 0.100 M HCl is titrated with 0.0500 M NaOH. What is the pH of the solution after the addition of 15.0 mL of NaOH?
A. 2.00
Correct B. 3.00
C. 4.00
D. 5.00

Correct Answer: B

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Question 23 View Details
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
Correct B. 6.25 g
C. 7.50 g
D. 8.75 g

Correct Answer: B

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Question 24 View Details
A sample of gas has a volume of 250 mL at a pressure of 750 mmHg and a temperature of 20°C. What is the volume of the gas at a pressure of 1000 mmHg and a temperature of 30°C?
A. 200 mL
B. 250 mL
Correct C. 300 mL
D. 350 mL

Correct Answer: C

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Question 25 View Details
The element with atomic number 12 is _______.
Correct A. Magnesium
B. Silicon
C. Germanium
D. Tin

Correct Answer: A

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