Exam Body

Year

Subject

Paper Type

POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME JOSEPH AYO BABALOLA UNIVERSITY 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

A reaction is said to be at equilibrium when the rates of forward and reverse reactions are equal. What is the term for the rate of the forward reaction?

A. Rate of reaction

Correct B. Rate of forward reaction

C. Rate of reverse reaction

D. Rate of equilibrium

Correct Answer: B

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

Question 2

A solution contains 0.50 M NaCl. What is the concentration of Cl- ions?

A. 0.25 M

Correct B. 0.50 M

C. 0.75 M

D. 1.00 M

Correct Answer: B

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

Question 3

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the solution

B. To measure the pH of the solution

C. To measure the concentration of the solution

D. To measure the temperature of the solution

Correct Answer: A

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

Question 4

A solution contains 0.20 M HCl. What is the concentration of H+ ions?

A. 0.10 M

Correct B. 0.20 M

C. 0.30 M

D. 0.40 M

Correct Answer: B

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

Question 5

A diagram of a chemical apparatus is shown below. What is the purpose of the test tube?

Correct A. To mix the reac\tants

B. To heat the reac\tants

C. To measure the volume of the solution

D. To measure the pH of the solution

Correct Answer: A

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

Question 6

The rate cons\tant (k) of a first-order reaction is given by the equation: ln\( [A]t/[A]0 \) = -kt. If the half-life of the reaction is 10 minutes, what is the value of k?

Correct A. 0.0693 min^-1

B. 0.693 min^-1

C. 6.93 min^-1

D. 69.3 min^-1

Correct Answer: A

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

Question 7

A solution contains 0.1 M NH3 and 0.1 M NH4Cl. What is the pH of the solution?

A. 9.25

Correct B. 9.75

C. 10.25

D. 10.75

Correct Answer: B

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

Question 8

A sample of CO2 gas is collected over water at 25°C and 1 atm. If the partial pressure of CO2 is 0.5 atm, what is the mole \fraction of CO2 in the gas mixture?

Correct A. 0.33

B. 0.5

C. 0.67

D. 0.75

Correct Answer: A

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

Question 9

A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?

A. 0.5

Correct B. 1.0

C. 2.0

D. 3.0

Correct Answer: B

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

Question 10

A 10.0 g sample of a polymer is dissolved in 100.0 mL of solvent. If the density of the solution is 1.2 g/mL, what is the molar mass of the polymer?

A. 1000 g/mol

B. 2000 g/mol

Correct C. 5000 g/mol

D. 10000 g/mol

Correct Answer: C

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

Question 11

A sample of water contains 1.0 mg/L of dissolved oxygen. Calculate the volume of water (in liters) that contains 0.25 g of dissolved oxygen.

A. 250 L

Correct B. 2500 L

C. 25000 L

D. 250000 L

Correct Answer: B

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

Question 12

The reaction between sulfuric acid and sodium hydroxide is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 25.0 g of sulfuric acid is added to 100.0 g of sodium hydroxide, what is the limiting reac\tant?

Correct A. Sulfuric acid

B. Sodium hydroxide

C. Neither

D. Both

Correct Answer: A

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

Question 13

A 2.50 M solution of sodium chloride is prepared by dissolving 75.0 g of sodium chloride in 250.0 mL of water. What is the molarity of the solution?

A. 0.30 M

Correct B. 0.50 M

C. 0.75 M

D. 1.00 M

Correct Answer: B

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

Question 14

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

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To separate the titrant and analyte

Correct Answer: A

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

Question 15

The periodic table is arranged in a way that elements with similar properties are placed in the same group. What is the name of this property?

A. Atomic number

B. Atomic mass

C. Electronegativity

Correct D. Valency

Correct Answer: D

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

Question 16

Determine the s\tandard Gibbs free energy change for the reaction: 2Ag+(aq) + 2Cl-(aq) → Ag2Cl2(s). Given that ΔH° = -120 kJ/mol and ΔS° = 0.25 kJ/mol·K.

A. -120 kJ/mol

Correct B. -240 kJ/mol

C. -300 kJ/mol

D. -360 kJ/mol

Correct Answer: B

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

Question 17

A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added. Given that the pKa of HCl is 7.0.

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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

Question 18

A sample of air contains 21% O2, 78% N2, and 1% other gases. Calculate the partial pressure of O2 at a total pressure of 101.3 kPa.

A. 21.3 kPa

Correct B. 21.7 kPa

C. 22.1 kPa

D. 22.5 kPa

Correct Answer: B

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

Question 19

A 2.0 L flask contains 0.5 mol of CO2 at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

A. 101.3 kPa

Correct B. 102.1 kPa

C. 103.0 kPa

D. 104.0 kPa

Correct Answer: B

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

Question 20

A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. Calculate the number of moles of HCl that have reacted after 25 mL of NaOH has been added.

A. 0.005 mol

Correct B. 0.010 mol

C. 0.015 mol

D. 0.020 mol

Correct Answer: B

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

Question 21

Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in ethanol.

Correct A. Substitution reaction

B. Elimination reaction

C. Addition reaction

D. Condensation reaction

Correct Answer: A

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

Question 22

Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + 3H2O(l) → 2Al(OH)3(s) + 3/2H2(g).

Correct A. -1720 kJ/mol

B. -1850 kJ/mol

C. -1780 kJ/mol

D. -1800 kJ/mol

Correct Answer: A

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

Question 23

A 0.500 M solution of HCl is mixed with a 0.750 M solution of NaOH. What is the concentration of the resulting solution?

Correct A. 0.625 M

B. 0.750 M

C. 0.875 M

D. 1.125 M

Correct Answer: A

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

Question 24

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. 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 25

A 50.0 mL sample of 0.500 M H2SO4 is mixed with 50.0 mL of 0.500 M NaOH. What is the concentration of the resulting solution?

A. 0.250 M

Correct B. 0.500 M

C. 0.750 M

D. 1.000 M

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