Exam Body

Year

Subject

Paper Type

POST UTME IGBINEDION UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME IGBINEDION 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

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K, given that the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, and the rate of disappearance of NO is 0.05 M/s.

Correct A. \( 2.5 \times 10^{-3} , \text{s}^{-1} \)

B. \( 5.0 \times 10^{-3} , \text{s}^{-1} \)

C. \( 1.0 \times 10^{-2} , \text{s}^{-1} \)

D. \( 2.0 \times 10^{-2} , \text{s}^{-1} \)

Correct Answer: A

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

Question 2

A sample of a non-metallic oxide, X2O3, has a mass of 25.0 g and a volume of 2.50 L at 298 K. If the molar mass of X2O3 is 160 g/mol, calculate the partial pressure of X2O3 in the gas phase.

A. \( 1.25 \times 10^{2} , \text{kPa} \)

Correct B. \( 2.50 \times 10^{2} , \text{kPa} \)

C. \( 3.75 \times 10^{2} , \text{kPa} \)

D. \( 5.00 \times 10^{2} , \text{kPa} \)

Correct Answer: B

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

Question 3

A 2.00 L flask contains 0.100 M H2(g) and 0.200 M Cl2(g) at 298 K. If the reaction: H2(g) + Cl2(g) → 2HCl(g) is allowed to proceed until equilibrium is reached, calculate the equilibrium partial pressures of H2 and Cl2.

A. \( P_{\text{H}_2} = 0.050 , \text{kPa}, , P_{\text{Cl}_2} = 0.100 , \text{kPa} \)

B. \( P_{\text{H}_2} = 0.100 , \text{kPa}, , P_{\text{Cl}_2} = 0.050 , \text{kPa} \)

Correct C. \( P_{\text{H}_2} = 0.050 , \text{kPa}, , P_{\text{Cl}_2} = 0.050 , \text{kPa} \)

D. \( P_{\text{H}_2} = 0.100 , \text{kPa}, , P_{\text{Cl}_2} = 0.100 , \text{kPa} \)

Correct Answer: C

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

Question 4

A 0.500 L flask contains 0.100 M H2(g) and 0.200 M Cl2(g) at 298 K. If the reaction: H2(g) + Cl2(g) → 2HCl(g) is allowed to proceed until equilibrium is reached, calculate the equilibrium concentrations of H2 and Cl2.

A. \( [\text{H}_2] = 0.050 , \text{M}, , [\text{Cl}_2] = 0.100 , \text{M} \)

B. \( [\text{H}_2] = 0.100 , \text{M}, , [\text{Cl}_2] = 0.050 , \text{M} \)

Correct C. \( [\text{H}_2] = 0.050 , \text{M}, , [\text{Cl}_2] = 0.050 , \text{M} \)

D. \( [\text{H}_2] = 0.100 , \text{M}, , [\text{Cl}_2] = 0.100 , \text{M} \)

Correct Answer: C

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

Question 5

A 1.00 L flask contains 0.100 M H2(g) and 0.200 M Cl2(g) at 298 K. If the reaction: H2(g) + Cl2(g) → 2HCl(g) is allowed to proceed until equilibrium is reached, calculate the equilibrium partial pressures of HCl.

A. \( P_{\text{HCl}} = 0.050 , \text{kPa} \)

B. \( P_{\text{HCl}} = 0.100 , \text{kPa} \)

Correct C. \( P_{\text{HCl}} = 0.150 , \text{kPa} \)

D. \( P_{\text{HCl}} = 0.200 , \text{kPa} \)

Correct Answer: C

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

Question 6

Determine the number of moles of oxygen gas (O2) required to completely combust 2.50 moles of propane (C3H8) according to the balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O.

A. 0.50 mol

Correct B. 1.25 mol

C. 2.50 mol

D. 5.00 mol

Correct Answer: B

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

Question 7

A 2.00 L sample of a gas at 25°C is collected over water at 25°C. If the total pressure is 750 mmHg, what is the partial pressure of the gas?

A. 550 mmHg

B. 600 mmHg

Correct C. 650 mmHg

D. 700 mmHg

Correct Answer: C

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

Question 8

The boiling point of a solution containing 10.0 g of glu\cose (C6H12O6) in 100.0 g of water is 102.5°C. What is the molar mass of the solute?

A. 180 g/mol

B. 200 g/mol

Correct C. 220 g/mol

D. 240 g/mol

Correct Answer: C

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

Question 9

A solution containing 5.00 g of sodium chloride (NaCl) in 50.0 g of water has a boiling point of 100.5°C. What is the molality of the solution?

A. 0.100 m

Correct B. 0.200 m

C. 0.300 m

D. 0.400 m

Correct Answer: B

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

Question 10

A 2.00 L sample of a gas at 25°C is collected over water at 25°C. If the total pressure is 750 mmHg, what is the partial pressure of the gas?

A. 550 mmHg

B. 600 mmHg

Correct C. 650 mmHg

D. 700 mmHg

Correct Answer: C

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

Question 11

A reaction is carried out at cons\tant pressure. The reaction is exothermic and has a negative enthalpy change. Which of the following statements is true?

Correct A. The reaction is spon\taneous.

B. The reaction is non-spon\taneous.

C. The reaction is at equilibrium.

D. The reaction is \endothermic.

Correct Answer: A

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

Question 12

A sample of hydrocarbon is analyzed by combustion and found to have a molecular formula of C5H12. What is the name of the hydrocarbon?

Correct A. Pen\tane

B. Isopen\tane

C. Neopen\tane

D. 2-Methylbu\tane

Correct Answer: A

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

Question 13

A sample of a gas at 25°C and 1 atm is heated to 50°C at cons\tant volume. What is the new pressure of the gas in atm?

A. 2 atm

B. 1 atm

C. 0.5 atm

Correct D. 4 atm

Correct Answer: D

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

Question 14

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?

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 15

A metal oxide has the formula M2O3. If 2.5 g of the oxide is dissolved in 50 mL of 0.1 M HCl, what is the concentration of the resulting solution in M?

A. 0.01 M

B. 0.1 M

Correct C. 0.5 M

D. 1 M

Correct Answer: C

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

Question 16

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 in L?

A. 1 L

B. 2 L

Correct C. 4 L

D. 8 L

Correct Answer: C

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

Question 17

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 40 mL of NaOH has been added?

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 18

The reaction of sodium hydroxide (NaOH) with ethanoic acid (CH3COOH) is a classic example of a redox reaction. What is the oxidation state of the carbon atom in the ethanoic acid molecule?

A. 0

B. -2

Correct C. +2

D. +4

Correct Answer: C

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

Question 19

A sample of a polymer is found to have a molecular weight of 50000 g/mol. If the polymer has a degree of polymerization of 200, what is the molecular weight of the repeating unit?

A. 250

Correct B. 500

C. 1000

D. 2000

Correct Answer: B

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

Question 20

The half-life of a radioactive subs\tance is 10 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 20 years?

Correct A. 25

B. 50

C. 75

D. 100

Correct Answer: A

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

Question 21

A solution of sodium chloride (NaCl) is prepared by dissolving 10 g of NaCl in 100 g of water. What is the concentration of the solution in g/L?

A. 0.1

Correct B. 0.5

C. 1

D. 5

Correct Answer: B

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

Question 22

The reaction of hydrogen gas (H2) with oxygen gas (O2) is a classic example of a combustion reaction. What is the balanced chemical equation for this reaction?

Correct A. 2H2 + O2 → 2H2O

B. H2 + O2 → H2O

C. 2H2 + 2O2 → 2H2O

D. H2 + 2O2 → 2H2O

Correct Answer: A

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

Question 23

A 0.1 M solution of sodium hydroxide (NaOH) is prepared by dissolving 4 g of NaOH in water to make 1 L of solution. What is the molarity of the solution if 2.5 g of NaOH is added to the solution?

Correct A. 0.2 M

B. 0.15 M

C. 0.12 M

D. 0.1 M

Correct Answer: A

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

Question 24

A polymer has a molecular weight of 50000 g/mol. If 2 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?

Correct A. 0.5 g/L

B. 0.2 g/L

C. 0.1 g/L

D. 0.05 g/L

Correct Answer: A

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

Question 25

A 1 L solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in water. What is the molarity of the solution?

Correct A. 1 M

B. 0.5 M

C. 0.2 M

D. 0.1 M

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