POST UTME CHRISTOPHER UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME CHRISTOPHER UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
Determine the number of moles of ΔH₂O(g) produced when 2.50 g of H₂(g) reacts with O₂(g) according to the equation: 2H₂(g) + O₂(g) → 2ΔH₂O(g).
A. 0.0500 mol
Correct B. 0.100 mol
C. 0.150 mol
D. 0.200 mol

Correct Answer: B

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Question 2
A 2.00 M solution of H₂SO₄ is titrated with 1.00 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 3
A diagram of a cell is shown below. What is the purpose of the salt bridge?
A. To prevent the mixing of the two solutions
B. To allow the flow of electrons
Correct C. To maintain electrical neutrality
D. To increase the voltage of the cell

Correct Answer: C

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Question 4
A 1.00 M solution of H₂SO₄ is titrated with 1.00 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
Correct D. 5.00

Correct Answer: D

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Question 5
A diagram of a titration setup is shown below. What is the purpose of the burette?
Correct A. To measure the volume of the solution
B. To mix the two solutions
C. To prevent the mixing of the two solutions
D. To increase the voltage of the cell

Correct Answer: A

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Question 6
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. Assume the reaction is: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1207.6 kJ/mol
B. -1207.6 kJ/mol
C. -1207.6 kJ/mol
D. -1207.6 kJ/mol

Correct Answer: A

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Question 7
A solution contains 0.050 M NH3 and 0.050 M NH4Cl. Calculate the concentration of OH- ions in the solution.
Correct A. 0.025 M
B. 0.050 M
C. 0.050 M
D. 0.100 M

Correct Answer: A

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Question 8
A 2.0 L flask contains 0.050 M H2(g) and 0.050 M I2(g). If the reaction is: H2(g) + I2(g) → 2HI(g), calculate the equilibrium cons\tant (Kp) at 298 K.
Correct A. 1.0
B. 1.0
C. 1.0
D. 1.0

Correct Answer: A

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Question 9
A 100 mL sample of a solution containing 0.050 M NaOH is titrated with 0.050 M HCl. Calculate the pH of the solution after the titration.
Correct A. 7.0
B. 7.0
C. 7.0
D. 7.0

Correct Answer: A

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Question 10
A 2.0 L flask contains 0.050 M H2(g) and 0.050 M I2(g). If the reaction is: H2(g) + I2(g) → 2HI(g), calculate the equilibrium cons\tant (Kc) at 298 K.
Correct A. 1.0
B. 1.0
C. 1.0
D. 1.0

Correct Answer: A

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Question 11
Determine the molar mass of a polymer with the following repeating unit: CH2CH2OCH2CH2OCH3. Assume that the polymer has a degree of polymerization of 100.
A. 200 g/mol
Correct B. 300 g/mol
C. 400 g/mol
D. 500 g/mol

Correct Answer: B

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Question 12
A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: 2X + Cl2 → 2XCl. If 2.5 g of X reacts with 1.5 g of Cl2, what is the molar mass of X?
A. 50 g/mol
B. 75 g/mol
Correct C. 100 g/mol
D. 125 g/mol

Correct Answer: C

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Question 13
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 14
A mixture of 50 mL of ethanol (C2H5OH) and 50 mL of water is titrated with a solution of sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 15
A diagram of a titration setup is shown below. If the burette contains 25 mL of a solution with a concentration of 0.5 M, what is the concentration of the solution in the flask?
A. 0.1 M
Correct B. 0.5 M
C. 1.0 M
D. 2.0 M

Correct Answer: B

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Question 16
A 0.1 M solution of a weak base, B, is prepared by dissolving 0.1 g of B in 100 mL of water. If the density of the solution is 1.0 g/mL, what is the volume of the solution in liters?
A. 0.1 L
Correct B. 0.2 L
C. 0.3 L
D. 0.4 L

Correct Answer: B

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Question 17
A sample of a metal, M, is heated in a crucible until it melts. The temperature of the metal is measured to be 800°C. If the specific heat capacity of the metal is 0.1 J/g°C, what is the energy required to melt 100 g of the metal?
A. 100 J
B. 200 J
Correct C. 300 J
D. 400 J

Correct Answer: C

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Question 18
A 2.0 g sample of a polymer, P, is dissolved in 100 mL of a solvent. If the concentration of the solution is 0.1 g/mL, what is the molar mass of the polymer?
A. 100 g/mol
B. 200 g/mol
Correct C. 300 g/mol
D. 400 g/mol

Correct Answer: C

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Question 19
A 1.0 L sample of a gas, G, is collected over water at a temperature of 25°C and a pressure of 1.0 atm. If the vapor pressure of water at 25°C is 0.03 atm, what is the partial pressure of the gas?
Correct A. 0.97 atm
B. 0.98 atm
C. 0.99 atm
D. 1.0 atm

Correct Answer: A

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Question 20
A 0.1 M solution of a weak acid, HA, is prepared by dissolving 0.1 g of HA in 100 mL of water. If the density of the solution is 1.0 g/mL, what is the pH of the solution?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 21
A 1.0 L sample of a gas, G, is collected over water at a temperature of 25°C and a pressure of 1.0 atm. If the vapor pressure of water at 25°C is 0.03 atm, what is the mole \fraction of the gas?
Correct A. 0.97
B. 0.98
C. 0.99
D. 1.0

Correct Answer: A

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Question 22
A 0.1 M solution of a weak base, B, is prepared by dissolving 0.1 g of B in 100 mL of water. If the density of the solution is 1.0 g/mL, what is the pOH of the solution?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 23
A 2.0 g sample of a polymer, P, is dissolved in 100 mL of a solvent. If the concentration of the solution is 0.1 g/mL, what is the molecular weight of the polymer?
A. 100 g/mol
B. 200 g/mol
Correct C. 300 g/mol
D. 400 g/mol

Correct Answer: C

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Question 24
A 1.0 L sample of a gas, G, is collected over water at a temperature of 25°C and a pressure of 1.0 atm. If the vapor pressure of water at 25°C is 0.03 atm, what is the volume of the gas at STP?
A. 0.1 L
Correct B. 0.2 L
C. 0.3 L
D. 0.4 L

Correct Answer: B

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Question 25
A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas, assuming ideal behavior.
A. 1.8 atm
B. 2.1 atm
Correct C. 2.5 atm
D. 3.1 atm

Correct Answer: C

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