POST UTME KSU 2019 Chemistry | Objective

Are you preparing for POST UTME KSU 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 empirical formula of a compound containing 40.0 g of carbon, 6.0 g of hydrogen, and 54.0 g of oxygen.
Correct A. CH2O
B. C2H4O2
C. C3H6O3
D. C4H8O4

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 298 K. What is the number of moles of nitrogen gas present?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A solution contains 2.5 g of glu\cose (C6H12O6) dissolved in 100 mL of water. What is the concentration of the solution in g/L?
A. 25
Correct B. 50
C. 75
D. 100

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
A 2.0 L sample of a gas at 2.5 atm and 298 K is compressed to 1.0 L at cons\tant temperature. What is the new pressure of the gas?
A. 5
Correct B. 6.25
C. 7.5
D. 8.75

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
A 10.0 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the solution after the titration?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
A 25 mL sample of a 0.5 M solution of NaOH is added to 50 mL of a 0.2 M solution of HCl. What is the resulting pH?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
A 100 mL sample of a 0.1 M solution of H2SO4 is titrated with a 0.2 M solution of NaOH. What is the pH of the resulting solution after 50 mL of NaOH has been added?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
A 50 mL sample of a 0.2 M solution of HCl is added to 100 mL of a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
A 25 mL sample of a 0.5 M solution of NaOH is added to 50 mL of a 0.2 M solution of HCl. What is the resulting pH?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 11
Determine the number of moles of $\text{O}_2$ required to react with 2.50 moles of $\text{C}_2\text{H}_4$ according to the equation $\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$.
A. 1.25 moles
B. 2.50 moles
Correct C. 3.75 moles
D. 5.00 moles

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
A sample of $\text{H}_2\text{SO}_4$ has a mass of 250.0 g. If the molar mass of $\text{H}_2\text{SO}_4$ is 98.08 g/mol, calculate the number of moles of $\text{H}_2\text{SO}_4$ present in the sample.
A. 2.55 mol
Correct B. 2.56 mol
C. 2.57 mol
D. 2.58 mol

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
A solution contains 0.500 M $\text{CaCl}_2$ and 0.500 M $\text{NaOH}$. Calculate the concentration of $\text{Ca(OH)}_2$ formed after the reaction is complete.
Correct A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, calculate the partial pressure of the gas.
A. 0.970 atm
B. 0.980 atm
C. 0.990 atm
Correct D. 1.00 atm

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
A 250.0 g sample of a mixture of $\text{KNO}_3$ and $\text{NaCl}$ is dissolved in 250.0 mL of water. If the resulting solution has a conductivity of 1.50 mS/cm, calculate the molar conductivity of the solution.
A. 0.0100 S m^2/mol
B. 0.0150 S m^2/mol
Correct C. 0.0200 S m^2/mol
D. 0.0250 S m^2/mol

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
The atomic number of an element is 26. What is the number of protons in the nucleus of an atom of this element?
A. 25
Correct B. 26
C. 27
D. 28

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
Correct B. 7
C. 10
D. 12

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
A gas at 300 K has a volume of 2 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 1.6
B. 2.4
Correct C. 3.2
D. 4.8

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
A solution of 0.1 M FeCl3 is electrolyzed u\sing a platinum electrode. What is the mass of iron deposited at the cathode after 2 hours?
A. 0.06
B. 0.09
Correct C. 0.12
D. 0.15

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
A mixture of 2 g of NaCl and 1 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1
B. 0.15
Correct C. 0.2
D. 0.25

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub:
Chat with Support