Exam Body

Year

Subject

Paper Type

POST UTME NILE UNIVERSITY 2017 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 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.

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 2

A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas.

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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

Question 3

A 50 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 25 mL

Correct B. 50 mL

C. 75 mL

D. 100 mL

Correct Answer: B

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

Question 4

A 1.0 L flask contains 0.5 mol of CO2 at 27°C. Calculate the partial pressure of CO2.

A. 0.5 atm

Correct B. 1.0 atm

C. 1.5 atm

D. 2.0 atm

Correct Answer: B

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

Question 5

A 50 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution at the equivalence point.

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 6

Determine the number of moles of ΔH2O produced when 2.5 g of H2SO4 reacts with an excess of NaOH in the following reaction: H2SO4 + 2NaOH → Na2SO4 + ΔH2O. The molar mass of H2SO4 is 98.08 g/mol.

A. 0.025 mol

Correct B. 0.050 mol

C. 0.075 mol

D. 0.100 mol

Correct Answer: B

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

Question 7

A 25.0 mL sample of 0.100 M HCl is titrated with 0.0500 M NaOH. Calculate the pH of the solution after 15.0 mL of NaOH has been added.

A. 2.00

B. 2.50

Correct C. 3.00

D. 3.50

Correct Answer: C

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

Question 8

The energy of an electron in the nth orbit of a hydrogen atom is given by the equation E_n = -13.6/n^2 eV. Calculate the energy of an electron in the 3rd orbit.

Correct A. -1.51 eV

B. -1.91 eV

C. -2.10 eV

D. -2.36 eV

Correct Answer: A

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

Question 9

A sample of nitrogen gas occupies a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 298 K. Calculate the number of moles of nitrogen gas present.

A. 0.0100 mol

Correct B. 0.0200 mol

C. 0.0300 mol

D. 0.0400 mol

Correct Answer: B

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

Question 10

A 10.0 g sample of sulfur is burned in oxygen to produce sulfur dioxide. Calculate the volume of oxygen gas consumed at STP.

A. 2.00 L

B. 4.00 L

Correct C. 6.00 L

D. 8.00 L

Correct Answer: C

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

Question 11

A solution of $K_2Cr_2O_7$ in $H_2SO_4$ is used to oxidize $Fe^{2+}$ ions to $Fe^{3+}$ ions. The reaction is as follows: $K_2Cr_2O_7 + 7H_2SO_4 + 6FeSO_4 \rightarrow K_2SO_4 + 3Cr^3+ + 7H_2O + 6Fe^{3+} + 8SO_4^{2-}$.

A. Cr^3+

Correct B. Fe^{3+}

C. SO_4^{2-}

D. H_2O

Correct Answer: B

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 200. What is the molar mass of the repeating unit?

A. 250 g/mol

Correct B. 500 g/mol

C. 750 g/mol

D. 1000 g/mol

Correct Answer: B

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

Question 13

A reaction has a s\tandard enthalpy change of -200 kJ/mol and a s\tandard entropy change of -100 J/K/mol. What is the s\tandard Gibbs free energy change at 298 K?

A. -250 kJ/mol

Correct B. -200 kJ/mol

C. -150 kJ/mol

D. -100 kJ/mol

Correct Answer: B

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

Question 14

A first-order reaction has a rate cons\tant of 0.05 min^-1. What is the half-life of the reaction?

A. 10 min

Correct B. 20 min

C. 30 min

D. 40 min

Correct Answer: B

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

Question 15

A solution of $CH_3CH_2OH$ is 0.5 M. What is the concentration of $H^+$ ions in the solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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

Question 16

A 0.1 M solution of a weak acid HA has a pH of 4.5. Calculate the concentration of the conjugate base A-.

Correct A. 0.01 M

B. 0.1 M

C. 1 M

D. 10 M

Correct Answer: A

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

Question 17

The half-life of a radioactive subs\tance is 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?

A. 100 Bq

B. 500 Bq

C. 200 Bq

Correct D. 50 Bq

Correct Answer: D

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

Question 18

A 2.0 g sample of a non-metallic element has a density of 3.0 g/cm^3. What is the volume of the sample in cm^3?

Correct A. 0.67 cm^3

B. 1.0 cm^3

C. 2.0 cm^3

D. 3.0 cm^3

Correct Answer: A

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

Question 19

A solution contains 0.1 M NaCl. What is the concentration of Cl- ions in the solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

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

Question 20

A 1.0 M solution of a strong acid HCl has a pH of 0. Calculate the concentration of H+ ions in the solution.

Correct A. 1.0 M

B. 10 M

C. 100 M

D. 1000 M

Correct Answer: A

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

Question 21

Determine the solubility of CaF2 in water at 25°C, given that the solubility product cons\tant (Ksp) is 3.9 × 10^-11. The molar mass of CaF2 is 78.08 g/mol.

Correct A. 0.05 M

B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: A

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

Question 22

A 25.0 mL sample of 0.100 M NaOH is mixed with 25.0 mL of 0.100 M HCl. 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

Question 23

The reaction between H2O2 and NaOH is represented by the equation: H2O2 + 2NaOH → Na2O2 + 2H2O. What is the limiting reac\tant if 25.0 mL of 0.100 M H2O2 is mixed with 25.0 mL of 0.100 M NaOH?

Correct A. H2O2

B. NaOH

C. Na2O2

D. H2O

Correct Answer: A

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

Question 24

A 1.00 L solution contains 0.100 mol of C6H12O6. What is the molarity of the solution?

Correct A. 0.100 M

B. 0.500 M

C. 1.00 M

D. 2.00 M

Correct Answer: A

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

Question 25

The reaction between CH4 and O2 is represented by the equation: CH4 + 2O2 → CO2 + 2H2O. What is the limiting reac\tant if 25.0 mL of 0.100 M CH4 is mixed with 25.0 mL of 0.100 M O2?

A. CH4

Correct B. O2

C. CO2

D. H2O

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