POST UTME ACHIEVERS UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME ACHIEVERS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
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 2
The diagram below shows a titration setup. What is the purpose of the burette?
Correct A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution

Correct Answer: A

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Question 3
A 2.5 g sample of NaOH is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.5 M
D. 1 M

Correct Answer: C

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Question 4
The diagram below shows a graph of the variation of pressure with volume for a gas. What is the shape of the graph?
A. Straight line
Correct B. Curved line
C. Parabolic curve
D. Hyperbolic curve

Correct Answer: B

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Question 5
A 1.0 M solution of HCl is titrated with a 1.0 M solution of NaOH. What is the pH of the solution after the titration?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 6
In the extraction of copper from its ore, the following reaction occurs: 2Cu2O + C → 2Cu + 2CO. What is the oxidation state of copper in Cu2O?
A. +1
Correct B. +2
C. +3
D. +4

Correct Answer: B

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Question 7
The reaction of an alkane with chlorine gas is represented by the equation: R-H + Cl2 → R-Cl + HCl. What is the type of reaction that occurs?
A. Substitution reaction
Correct B. Addition reaction
C. Elimination reaction
D. Condensation reaction

Correct Answer: B

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Question 8
A solution contains 2.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 9
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the solution
Correct B. To measure the volume of the titrant
C. To mix the solution and titrant
D. To filter the solution

Correct Answer: B

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Question 10
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase?
Correct A. To separate the components of a mixture
B. To identify the components of a mixture
C. To measure the concentration of a component
D. To purify a component

Correct Answer: A

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Question 11
Determine the oxidation state of sulfur in the compound SO3.
A. +2
B. +4
Correct C. +6
D. -2

Correct Answer: C

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Question 12
What is the major product of the reaction between ethene and bromine?
Correct A. C2H4Br2
B. C2H5Br
C. C2H6
D. C2H4

Correct Answer: A

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Question 13
Calculate the enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s).
Correct A. -852.6 kJ/mol
B. -1423.8 kJ/mol
C. +852.6 kJ/mol
D. +1423.8 kJ/mol

Correct Answer: A

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Question 14
Identify the type of bond present in the molecule H2O.
A. Ionic
Correct B. Covalent
C. Metallic
D. Hydrogen

Correct Answer: B

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Question 15
What is the molar mass of the compound C6H12O6?
Correct A. 180.16 g/mol
B. 60.05 g/mol
C. 12.01 g/mol
D. 36.03 g/mol

Correct Answer: A

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Question 16
Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in ethanol.
Correct A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Condensation reaction

Correct Answer: A

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Question 17
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -824.2 kJ/mol.
Correct A. -1851.9 kJ/mol
B. -1751.9 kJ/mol
C. -1859.9 kJ/mol
D. -1759.9 kJ/mol

Correct Answer: A

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Question 18
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 19
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH, what is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 20
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH, what is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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