Exam Body

Year

Subject

Paper Type

POST UTME NILE UNIVERSITY 2024 Chemistry | Objective

Are you preparing for POST UTME NILE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

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.

A. 1.5 atm

Correct B. 2.1 atm

C. 2.5 atm

D. 3.2 atm

Correct Answer: B

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

Question 2

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 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 3

A diagram of a titration setup is shown below.

A. The burette contains the acid.

B. The beaker contains the acid.

Correct C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: C

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

Question 4

A 1.0 L sample of a 0.5 M solution of NaOH is mixed with a 1.0 L sample of a 0.5 M solution of HCl. What is the pH of the resulting solution?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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

Question 5

A diagram of a gas law setup is shown below.

A. The gas law is Boyle's Law.

Correct B. The gas law is Charles' Law.

C. The gas law is Gay-Lussac's Law.

D. The gas law is Avogadro's Law.

Correct Answer: B

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

Question 6

The polymerization of ethene to polyethene involves the formation of a new bond between the monomer units. What type of bond is formed during this process?

Correct A. Covalent bond

B. Ionic bond

C. Hydrogen bond

D. Van der Waals force

Correct Answer: A

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

Question 7

A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2 in the sample?

A. 0.95 atm

B. 0.99 atm

Correct C. 1.01 atm

D. 1.05 atm

Correct Answer: C

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

Question 8

The element with atomic number 12 is _______.

A. Mg

Correct B. Ca

C. Si

D. Al

Correct Answer: B

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

Question 9

The reaction 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s) is an example of a _______ reaction.

A. Redox reaction

B. Synthesis reaction

C. Decomposition reaction

Correct D. Single displacement reaction

Correct Answer: D

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

Question 10

The diagram below shows a titration setup. What is the purpose of the burette in this setup?

Correct A. To measure the volume of the solution

B. To measure the concentration of the solution

C. To mix the solution with the analyte

D. To separate the solution from the analyte

Correct Answer: A

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

Question 11

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 cm^3 of the HCl solution requires 35 cm^3 of the NaOH solution for neutralization, calculate the number of moles of HCl in the initial solution.

Correct A. 0.0025 mol

B. 0.005 mol

C. 0.0075 mol

D. 0.01 mol

Correct Answer: A

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

Question 12

The diagram below shows a setup for electrolysis of a solution of CuSO4.

A. The anode is the electrode where reduction occurs.

B. The cathode is the electrode where oxidation occurs.

Correct C. The anode is the electrode where oxidation occurs.

D. The cathode is the electrode where reduction occurs.

Correct Answer: C

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

Question 13

A 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. If 20 cm^3 of the H2SO4 solution requires 30 cm^3 of the NaOH solution for neutralization, calculate the number of moles of H2SO4 in the initial solution.

Correct A. 0.003 mol

B. 0.006 mol

C. 0.009 mol

D. 0.012 mol

Correct Answer: A

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

Question 14

The diagram below shows a setup for the preparation of a solution of NaCl.

Correct A. The solution is prepared by dissolving NaCl in water.

B. The solution is prepared by heating NaCl.

C. The solution is prepared by dissolving NaCl in ethanol.

D. The solution is prepared by heating ethanol.

Correct Answer: A

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

Question 15

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 25 cm^3 of the HCl solution requires 35 cm^3 of the NaOH solution for neutralization, calculate the number of moles of NaOH in the initial solution.

A. 0.0025 mol

Correct B. 0.005 mol

C. 0.0075 mol

D. 0.01 mol

Correct Answer: B

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

Question 16

Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).

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 17

A 25 mL sample of a solution containing 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5 mL

B. 25 mL

Correct C. 37.5 mL

D. 50 mL

Correct Answer: C

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

Question 18

A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. Calculate the partial pressure of CO2 in the air at a total pressure of 101.3 kPa.

A. 1.013 kPa

B. 2.026 kPa

Correct C. 3.039 kPa

D. 4.052 kPa

Correct Answer: C

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

Question 19

A 2.5 g sample of a metal oxide is heated in a crucible until it is completely reduced to the metal. If the mass of the metal produced is 1.8 g, calculate the percentage of the metal in the oxide.

A. 72%

Correct B. 80%

C. 88%

D. 96%

Correct Answer: B

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

Question 20

A diagram of a titration setup is shown below. If the burette contains 0.1 M NaOH and the initial volume is 10 mL, calculate the volume of NaOH required to reach the equivalence point.

A. 20 mL

B. 30 mL

Correct C. 40 mL

D. 50 mL

Correct Answer: C

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

Question 21

The reaction of cyclohexane with bromine in the presence of light is an example of a ______________ reaction.

A. substitution reaction

B. elimination reaction

Correct C. addition reaction

D. substitution-elimination reaction

Correct Answer: C

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

Question 22

The rate cons\tant (k) for a first-order reaction is related to the half-life \( t1/2 \) by the equation:

A. \[ k = \frac{t_{1/2}}{0.693} \]

B. \[ k = \frac{2}{t_{1/2}} \]

Correct C. \[ k = \frac{0.693}{t_{1/2}} \]

D. \[ k = \frac{t_{1/2}}{2} \]

Correct Answer: C

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

Question 23

The electrolysis of water produces hydrogen gas at the ______________ electrode.

A. anode

Correct B. cathode

C. both

D. neither

Correct Answer: B

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

Question 24

The polymerization of ethylene to form polyethylene is an example of a ______________ reaction.

A. condensation reaction

Correct B. addition reaction

C. substitution reaction

D. elimination reaction

Correct Answer: B

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

Question 25

The reaction of ozone (O3) with chlorine gas (Cl2) is an example of a ______________ reaction.

Correct A. redox reaction

B. acid-base reaction

C. oxidation-reduction reaction

D. neutralization reaction

Correct Answer: A

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