POST UTME RHEMA UNIVERSITY 2024 Chemistry | Objective

Are you preparing for POST UTME RHEMA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
A 2.5 g sample of a non-metallic oxide of nitrogen is decomposed by heating with graphite in a stream of hydrogen gas. The volume of hydrogen gas produced at 25°C and 1 atm is 2.5 L. Calculate the molar mass of the oxide.
A. 60 g/mol
Correct B. 80 g/mol
C. 100 g/mol
D. 120 g/mol

Correct Answer: B

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Question 2
A 10 mL sample of a 0.5 M solution of NaOH is titrated with a 0.1 M solution of HCl. Calculate the number of moles of HCl required to neutralize the NaOH.
A. 0.05 mol
Correct B. 0.1 mol
C. 0.15 mol
D. 0.2 mol

Correct Answer: B

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Question 3
A 2.0 g sample of a hydrocarbon is burned in a bomb calorimeter. The heat released is 12.5 kJ. Calculate the molar mass of the hydrocarbon.
A. 40 g/mol
B. 60 g/mol
Correct C. 80 g/mol
D. 100 g/mol

Correct Answer: C

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Question 4
A 5.0 mL sample of a 0.1 M solution of NaOH is titrated with a 0.2 M solution of HCl. Calculate the pH of the resulting solution.
A. 2
B. 3
Correct C. 4
D. 5

Correct Answer: C

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Question 5
A 10 mL sample of a 0.5 M solution of HCl is mixed with a 10 mL sample of a 0.5 M solution of NaOH. Calculate the resulting pH.
A. 2
Correct B. 3
C. 4
D. 5

Correct Answer: B

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Question 6
A solution of 0.1 M NaCl is mixed with 0.1 M NaOH in a 1:1 ratio. If the reaction is allowed to proceed to equilibrium, what is the concentration of Cl- ions in the resulting solution?
A. 0.05 M
B. 0.1 M
Correct C. 0.15 M
D. 0.2 M

Correct Answer: C

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Question 7
A 2.0 g sample of a metal oxide is heated in a stream of hydrogen gas, producing 1.2 g of water. If the metal oxide is composed of only one type of metal, what is the molar mass of the metal?
A. 40 g/mol
B. 60 g/mol
Correct C. 80 g/mol
D. 100 g/mol

Correct Answer: C

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Question 8
A 10.0 mL sample of a 0.1 M solution of NaOH is mixed with 20.0 mL of a 0.2 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 9
A 1.0 M solution of CaCl2 is mixed with a 1.0 M solution of Na2SO4 in a 1:1 ratio. What is the concentration of Ca2+ ions in the resulting solution?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 10
A 2.0 g sample of a metal is heated in a stream of oxygen gas, producing 2.8 g of the metal oxide. If the metal oxide is composed of only one type of metal, what is the molar mass of the metal?
A. 40 g/mol
B. 60 g/mol
Correct C. 80 g/mol
D. 100 g/mol

Correct Answer: C

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Question 11
A 10.0 mL sample of a 0.1 M solution of HCl is mixed with 20.0 mL of a 0.2 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 12
A 1.0 M solution of NaCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the concentration of Cl- ions in the resulting solution?
A. 0.5 M
B. 1.0 M
Correct C. 1.5 M
D. 2.0 M

Correct Answer: C

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Question 13
A 2.0 g sample of a metal is heated in a stream of hydrogen gas, producing 1.2 g of water. If the metal is composed of only one type of metal, what is the molar mass of the metal?
A. 40 g/mol
B. 60 g/mol
Correct C. 80 g/mol
D. 100 g/mol

Correct Answer: C

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Question 14
A 10.0 mL sample of a 0.1 M solution of NaOH is mixed with 20.0 mL of a 0.2 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 15
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of the acid HA.
A. 0.1 M
Correct B. 0.01 M
C. 0.001 M
D. 0.0001 M

Correct Answer: B

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Question 16
A metal M has a s\tandard electrode potential of +0.5 V. What is the potential of the metal M electrode when it is in contact with a solution containing 0.1 M M^2+ ions?
A. +0.4 V
B. +0.5 V
Correct C. +0.6 V
D. +0.7 V

Correct Answer: C

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Question 17
A 2.0 g sample of a metal M is heated in a crucible until it melts. The mass of the crucible and the metal M after heating is 2.5 g. What is the molar mass of the metal M?
A. 50 g/mol
B. 60 g/mol
Correct C. 70 g/mol
D. 80 g/mol

Correct Answer: C

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Question 18
A 1.0 L solution of a 0.1 M NaOH is titrated with a 0.1 M HCl solution. What is the pH of the solution at the equivalence point?
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 19
A metal M has a s\tandard electrode potential of -0.5 V. What is the potential of the metal M electrode when it is in contact with a solution containing 0.1 M M^2+ ions?
A. -0.4 V
B. -0.5 V
Correct C. -0.6 V
D. -0.7 V

Correct Answer: C

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Question 20
A 1.0 L solution of a 0.1 M HCl is titrated with a 0.1 M NaOH solution. What is the pH of the solution at the equivalence point?
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 21
A 0.1 M solution of a weak base, B, is titrated with 0.1 M HCl. If the initial pH of the solution is 9.5, what is the pH after the addition of 10 mL of 0.1 M HCl?
A. 8.5
B. 9.5
Correct C. 10.5
D. 11.5

Correct Answer: C

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Question 22
A polymer has a molecular weight of 500,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.5 g/L
Correct B. 5 g/L
C. 50 g/L
D. 500 g/L

Correct Answer: B

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Question 23
A reaction is represented by the equation: 2A + B → 2C + D. If the rate of disappearance of A is 0.05 M/s, and the rate of appearance of C is 0.1 M/s, what is the rate of appearance of D?
A. 0.05 M/s
B. 0.1 M/s
Correct C. 0.15 M/s
D. 0.2 M/s

Correct Answer: C

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Question 24
A 1 L solution of a strong acid, HCl, is mixed with 1 L of a 0.1 M solution of a weak base, B. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 25
A 0.1 M solution of a weak acid, HA, is titrated with 0.1 M NaOH. If the initial pH of the solution is 4.5, what is the pH after the addition of 10 mL of 0.1 M NaOH?
A. 5.5
B. 6.5
Correct C. 7.5
D. 8.5

Correct Answer: C

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