POST UTME UI 2019 Chemistry | Objective

Are you preparing for POST UTME UI 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 number of moles of glu\cose (C6H12O6) that can be obtained from 2.5 L of a 0.5 M glu\cose solution.
A. 0.125 mol
Correct B. 0.25 mol
C. 0.5 mol
D. 1.0 mol

Correct Answer: B

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Question 2
A 25 mL sample of a 0.1 M NaOH solution is titrated with 0.1 M HCl. What is the pH of the resulting solution after the titration?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 3
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
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 4
A 10 mL sample of a 0.5 M HCl solution is mixed with 20 mL of a 0.2 M NaOH solution. What is the resulting pH of the solution?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 5
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase in this setup?
Correct A. To separate the components of a mixture
B. To identify the components of a mixture
C. To purify a subs\tance
D. To analyze the properties of a subs\tance

Correct Answer: A

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Question 6
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 7
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the number of moles of H2SO4.
A. 0.05
Correct B. 0.1
C. 0.15
D. 0.2

Correct Answer: B

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Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C(s).
Correct A. -393.5
B. -397.5
C. -401.5
D. -405.5

Correct Answer: A

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Question 9
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 10
A 10 mL sample of 0.5 M HCl is titrated with 1 M NaOH. Calculate the number of moles of NaOH.
A. 0.05
Correct B. 0.1
C. 0.15
D. 0.2

Correct Answer: B

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Question 11
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^-7.
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 12
A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. The solution is then titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the subs\tance?
A. 100
B. 200
Correct C. 300
D. 400

Correct Answer: C

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Question 13
A diagram of a titration setup is shown below. If 20 mL of 0.1 M HCl is added to the burette, what is the pH of the solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 14
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is added to the burette, what is the pH of the solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 15
A diagram of a gas law setup is shown below. If the pressure is increased from 1 atm to 2 atm, what is the new volume of the gas?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 16
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1206.5 kJ/mol
B. -1206.0 kJ/mol
C. -1207.0 kJ/mol
D. -1208.0 kJ/mol

Correct Answer: A

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Question 17
A 2.50 g sample of a metal carbonate is heated to produce a 1.25 g sample of the metal oxide. What is the molar mass of the metal carbonate?
A. 100 g/mol
Correct B. 120 g/mol
C. 140 g/mol
D. 160 g/mol

Correct Answer: B

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Question 18
A 10.0 mL sample of a 0.100 M solution of NaOH is mixed with a 10.0 mL sample of a 0.100 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
Correct B. 7.50
C. 8.00
D. 8.50

Correct Answer: B

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Question 19
A 5.00 g sample of a metal is heated in a stream of oxygen gas to produce a 2.50 g sample of the metal oxide. What is the molar mass of the metal?
A. 20 g/mol
B. 40 g/mol
Correct C. 60 g/mol
D. 80 g/mol

Correct Answer: C

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Question 20
A 10.0 mL sample of a 0.100 M solution of HCl is mixed with a 10.0 mL sample of a 0.100 M solution of NaOH. What is the pH of the resulting solution?
A. 7.00
B. 7.50
Correct C. 8.00
D. 8.50

Correct Answer: C

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Question 21
A 5.00 g sample of a metal is heated in a stream of oxygen gas to produce a 2.50 g sample of the metal oxide. What is the molar mass of the metal oxide?
A. 100 g/mol
B. 120 g/mol
Correct C. 140 g/mol
D. 160 g/mol

Correct Answer: C

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Question 22
A 10.0 mL sample of a 0.100 M solution of NaOH is mixed with a 10.0 mL sample of a 0.100 M solution of HCl. What is the molarity of the resulting solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.150 M
D. 0.200 M

Correct Answer: B

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Question 23
A 5.00 g sample of a metal is heated in a stream of oxygen gas to produce a 2.50 g sample of the metal oxide. What is the mass of the metal in the metal oxide?
A. 2.00 g
Correct B. 2.50 g
C. 3.00 g
D. 3.50 g

Correct Answer: B

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Question 24
A 10.0 mL sample of a 0.100 M solution of HCl is mixed with a 10.0 mL sample of a 0.100 M solution of NaOH. What is the pH of the resulting solution?
A. 7.00
B. 7.50
Correct C. 8.00
D. 8.50

Correct Answer: C

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Question 25
Determine the molar mass of a polymer with the following monomer units: CH2=CH-CH3, CH2=CH-CH2-CH3, and CH2=CH-CH2-CH2-CH3. Assume the polymer has a degree of polymerization of 100.
A. 500 g/mol
Correct B. 750 g/mol
C. 1000 g/mol
D. 1250 g/mol

Correct Answer: B

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