POST UTME CRAWFORD UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME CRAWFORD UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
A 0.1 M solution of AgNO3 is mixed with a 0.1 M solution of NaCl in a 1:1 ratio. What is the concentration of AgCl that will precipitate out of the solution?
A. 0.1 M
B. 0.05 M
Correct C. 0.01 M
D. 0.005 M

Correct Answer: C

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Question 2
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer has a degree of polymerization of 500, what is the molar mass of the repeating unit?
A. 200 g/mol
B. 400 g/mol
Correct C. 500 g/mol
D. 1000 g/mol

Correct Answer: C

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Question 3
A 2.0 L flask contains 1.0 mol of an ideal gas at 298 K. If the gas is heated to 373 K at cons\tant volume, what is the new pressure?
A. 2.5 atm
Correct B. 3.0 atm
C. 3.5 atm
D. 4.0 atm

Correct Answer: B

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Question 4
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 5
A sample of a metal has a density of 8.0 g/cm^3 and a volume of 2.0 cm^3. What is the mass of the sample?
Correct A. 16 g
B. 32 g
C. 48 g
D. 64 g

Correct Answer: A

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Question 6
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. The major product is 1,4-dibromocyclohexane. What is the major product of the reaction of 1,4-dibromocyclohexane with sodium in liquid ammonia?
A. Cyclohexanol
B. Cyclohexanone
Correct C. 1,4-Diaminocyclohexane
D. 1,4-Dibromocyclohexane

Correct Answer: C

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Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of CH4(g)?
Correct A. -74.8 kJ/mol
B. -74.8 kJ/mol
C. -74.8 kJ/mol
D. -74.8 kJ/mol

Correct Answer: A

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Question 8
A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. What is the pH of the resulting solution?
A. 0.5
Correct B. 1.0
C. 1.5
D. 2.0

Correct Answer: B

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Question 9
A 1.00 M solution of CaCl2 is mixed with a 1.00 M solution of Na2CO3. What is the molarity of the resulting solution?
A. 0.500 M
Correct B. 1.00 M
C. 1.50 M
D. 2.00 M

Correct Answer: B

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Question 10
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the pH of the resulting solution?
A. 0.5
Correct B. 1.0
C. 1.5
D. 2.0

Correct Answer: B

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Question 11
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. The pH of the solution after the addition of 25.0 mL of NaOH is 9.00. What is the concentration of the NaOH solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.200 M
D. 0.500 M

Correct Answer: B

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Question 12
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of 0.100 M HCl?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 13
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. The pH of the solution after the addition of 25.0 mL of NaOH is 9.00. What is the concentration of the NaOH solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.200 M
D. 0.500 M

Correct Answer: B

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Question 14
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of 0.100 M HCl?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 15
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. The pH of the solution after the addition of 25.0 mL of NaOH is 9.00. What is the concentration of the NaOH solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.200 M
D. 0.500 M

Correct Answer: B

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Question 16
Determine the number of moles of $\text{Ca}^{2+}$ ions in 250 mL of a solution containing 0.050 M $\text{CaCl}_2$.
A. 0.005 mol
Correct B. 0.010 mol
C. 0.015 mol
D. 0.020 mol

Correct Answer: B

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Question 17
A sample of $\text{Na}_2\text{SO}_4$ has a molar mass of 142 g/mol. What is the mass of 2.50 mol of $\text{Na}_2\text{SO}_4$?
A. 355 g
Correct B. 355.5 g
C. 356 g
D. 356.5 g

Correct Answer: B

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Question 18
A solution contains 0.050 M $\text{H}_2\text{SO}_4$. What is the concentration of $\text{H}^+$ ions in the solution?
A. 0.025 M
Correct B. 0.050 M
C. 0.075 M
D. 0.100 M

Correct Answer: B

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Question 19
A 250 mL sample of a solution contains 0.050 M $\text{CaCl}_2$. What is the number of moles of $\text{Ca}^{2+}$ ions in the solution?
A. 0.005 mol
Correct B. 0.010 mol
C. 0.015 mol
D. 0.020 mol

Correct Answer: B

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Question 20
A sample of $\text{Na}_2\text{SO}_4$ has a molar mass of 142 g/mol. What is the mass of 2.50 mol of $\text{Na}_2\text{SO}_4$?
A. 355 g
Correct B. 355.5 g
C. 356 g
D. 356.5 g

Correct Answer: B

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Question 21
Determine the s\tandard electrode potential for the reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s). Given that the s\tandard electrode potential for Cu2+/Cu is +0.34 V and for Zn2+/Zn is -0.76 V.
A. +0.10 V
Correct B. +0.50 V
C. +0.34 V
D. +0.76 V

Correct Answer: B

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Question 22
A solution of 0.1 M NaCl is electrolyzed u\sing a platinum electrode. If the current is 0.5 A, calculate the mass of chlorine gas liberated at the anode after 2 hours.
A. 0.05 g
B. 0.10 g
Correct C. 0.15 g
D. 0.20 g

Correct Answer: C

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Question 23
A 1.0 M solution of H2SO4 is electrolyzed u\sing a platinum electrode. If the current is 0.2 A, calculate the number of moles of oxygen gas liberated at the anode after 1 hour.
A. 0.01 mol
B. 0.02 mol
C. 0.03 mol
Correct D. 0.04 mol

Correct Answer: D

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Question 24
A 0.1 M solution of NaOH is electrolyzed u\sing a platinum electrode. If the current is 0.1 A, calculate the number of moles of hydrogen gas liberated at the cathode after 2 hours.
A. 0.01 mol
Correct B. 0.02 mol
C. 0.03 mol
D. 0.04 mol

Correct Answer: B

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Question 25
A 1.0 M solution of HCl is electrolyzed u\sing a platinum electrode. If the current is 0.2 A, calculate the mass of hydrogen gas liberated at the cathode after 1 hour.
A. 0.05 g
Correct B. 0.10 g
C. 0.15 g
D. 0.20 g

Correct Answer: B

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