POST UTME CHRISTOPHER UNIVERSITY 2025 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 2025 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of a weak acid HA \( K_a = 1.8 x 10^\( -5 \ \)) is mixed with a 0.1 M solution of a strong base NaOH. The initial pH of the acid solution is 4.5. What is the pH of the resulting solution after the acid and base have completely reacted?
A. 5.5
Correct B. 6.5
C. 7.5
D. 8.5

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
The diagram below shows a titration setup for determining the concentration of a strong acid.
Correct A. The acid is a strong acid.
B. The acid is a weak acid.
C. The base is a strong base.
D. The base is a weak base.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A solution contains 0.1 M NaCl and 0.1 M Na2SO4. What is the concentration of Cl- ions in the solution?
Correct A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
Correct A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
A 0.1 M solution of a weak acid HA \( K_a = 1.8 x 10^\( -5 \ \)) is mixed with a 0.1 M solution of a strong base NaOH. The initial pH of the acid solution is 4.5. What is the pH of the resulting solution after the acid and base have completely reacted?
A. 5.5
Correct B. 6.5
C. 7.5
D. 8.5

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
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, and ΔHf(Ca(s)) = -178.2 kJ/mol.
Correct A. -1206.8 kJ/mol
B. -1206.9 kJ/mol
C. -1206.7 kJ/mol
D. -1206.6 kJ/mol

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
A 2.5 M solution of HCl is mixed with a 1.0 M solution of NaOH. If the reaction is allowed to go to completion, what is the concentration of the resulting solution?
A. 1.25 M
Correct B. 2.25 M
C. 3.25 M
D. 4.25 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
A sample of air contains 20.0% O2, 70.0% N2, and 10.0% Ar by volume. What is the partial pressure of O2 in a sample of air at 1.00 atm?
Correct A. 0.20 atm
B. 0.40 atm
C. 0.60 atm
D. 0.80 atm

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
A 10.0 g sample of a metal carbonate is heated to produce a metal oxide and CO2 gas. If the mass of the metal oxide produced is 7.50 g, what is the molar mass of the metal?
A. 40.0 g/mol
B. 50.0 g/mol
Correct C. 60.0 g/mol
D. 70.0 g/mol

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
A 1.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. If the reaction is allowed to go to completion, what is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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