POST UTME MOUNTAIN TOP UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME MOUNTAIN TOP 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.

Practice these randomly selected questions to test your readiness.

Question 1
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution after 25.0 mL of NaOH has been added.
A. 2.00
Correct B. 3.00
C. 4.00
D. 5.00

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: \[ \text{X} + \text{Cl}_2 \rightarrow \text{XCl}_3 \]. If 2.50 g of X reacts with 1.50 g of Cl2, what is the empirical formula of XCl3?
A. XCl
B. XCl2
Correct C. XCl3
D. XCl4

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A 2.00 L flask contains 0.100 mol of a non-ideal gas at 298 K. The gas is heated to 373 K and the volume is increased to 3.00 L. What is the new pressure of the gas?
A. 1.00 atm
Correct B. 2.00 atm
C. 3.00 atm
D. 4.00 atm

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
A 0.100 M solution of HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 50.0 mL of NaOH has been added?
A. 2.00
B. 3.00
Correct C. 4.00
D. 5.00

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
A metal (X) reacts with oxygen gas to form a white solid. The reaction is as follows: \[ \text{X} + \text{O}_2 \rightarrow \text{X}_2\text{O}_3 \]. If 2.50 g of X reacts with 1.50 g of O2, what is the empirical formula of X2O3?
A. X2O
B. X2O2
Correct C. X2O3
D. X2O4

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) from the following reaction: CO2(g) → CO(g) + 1/2O2(g).
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
Correct D. -110.5 kJ/mol

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
A 2.5 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
Correct C. 0.5 M
D. 1.0 M

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 15 years?
Correct A. 12.5 g
B. 25 g
C. 50 g
D. 100 g

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
A solution contains 10% ethanol by volume. If 100 mL of the solution is diluted to 200 mL, what is the concentration of ethanol in the new solution?
A. 5%
Correct B. 10%
C. 15%
D. 20%

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
A 0.1 M solution of HCl is prepared by dissolving 0.1 g of HCl in 100 mL of water. Calculate the pH of the solution.
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 11
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25.0 mL
Correct C. 37.5 mL
D. 50.0 mL

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 1000. What is the molar mass of the repeating unit?
A. 50 g/mol
Correct B. 500 g/mol
C. 5000 g/mol
D. 50000 g/mol

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution at the equivalence point?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the concentration of HCl after the addition of 25.0 mL of 0.100 M NaOH?
A. 0.050 M
B. 0.100 M
Correct C. 0.150 M
D. 0.200 M

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the concentration of NaOH after the addition of 25.0 mL of 0.100 M HCl?
A. 0.050 M
Correct B. 0.100 M
C. 0.150 M
D. 0.200 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
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 NaOH?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of 0.100 M HCl?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the concentration of HCl after the addition of 50.0 mL of 0.100 M NaOH?
A. 0.050 M
B. 0.100 M
C. 0.150 M
D. 0.200 M

Correct Answer: VIEW ANSWER

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a strong base NaOH. If the initial pH of the acid solution is 3.5, what is the pH of the resulting solution after the reaction is complete?
A. 4.5
Correct B. 5.5
C. 6.5
D. 7.5

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
A sample of a gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.5 L
B. 1 L
Correct C. 2 L
D. 4 L

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
A solution of NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.5 M
C. 1 M
D. 2 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
A 2.0 M solution of HCl is titrated with a 2.0 M solution of NaOH. What is the pH of the resulting solution after 10 mL of NaOH has been added?
A. 2
B. 3
Correct C. 4
D. 5

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
A sample of a gas at 100°C and 1 atm is heated to 200°C at cons\tant pressure. What is the new volume of the gas?
A. 2 L
B. 4 L
C. 6 L
Correct D. 8 L

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
A 0.1 M solution of a weak base B is mixed with a 0.1 M solution of a strong acid HCl. If the initial pH of the base solution is 10.5, what is the pH of the resulting solution after the reaction is complete?
A. 5.5
B. 6.5
Correct C. 7.5
D. 8.5

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