Exam Body

Year

Subject

Paper Type

POST UTME GREENFIELD UNIVERSITY 2017 Chemistry | Objective

Are you preparing for POST UTME GREENFIELD 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

The reaction between chlorine gas and sodium hydroxide solution is a classic example of a redox reaction. Write the balanced chemical equation for this reaction.

A. \text{Cl}_2 + 2\text{NaOH} \rightarrow 2\text{NaCl} + \text{H}_2\text{O}

Correct B. \text{Cl}_2 + 2\text{NaOH} \rightarrow \text{NaCl} + \text{NaOCl} + \text{H}_2\text{O}

C. \text{Cl}_2 + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O}

D. \text{Cl}_2 + 2\text{NaOH} \rightarrow \text{NaCl} + \text{NaOCl}

Correct Answer: B

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

Question 2

A 2.5 M solution of sodium hydroxide is prepared by dissolving 12.5 g of sodium hydroxide in 250 mL of water. What is the concentration of the solution in moles per liter?

A. 0.1 M

B. 0.5 M

C. 1.0 M

Correct D. 2.5 M

Correct Answer: D

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

Question 3

The diagram below shows a circuit with a battery, a resistor, and a switch. If the switch is closed, what is the direction of the current flow?

Correct A. From A to B

B. From B to A

C. From C to A

D. From A to C

Correct Answer: A

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

Question 4

The reaction between hydrogen gas and oxygen gas is a classic example of a combustion reaction. Write the balanced chemical equation for this reaction.

A. \text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}

Correct B. \text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O}

C. \text{H}_2 + 2\text{O}_2 \rightarrow 2\text{H}_2\text{O}

D. \text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O}_2

Correct Answer: B

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

Question 5

A 1.0 M solution of hydrochloric acid is prepared by dissolving 36.5 g of hydrochloric acid in 250 mL of water. What is the concentration of the solution in moles per liter?

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 2.5 M

Correct Answer: C

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

Question 6

Determine the molar mass of a gas that occupies 2.5 L at 0.75 atm and 25°C. Use the ideal gas law to calculate the number of moles.

A. 0.25 mol

B. 0.50 mol

Correct C. 0.75 mol

D. 1.00 mol

Correct Answer: C

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

Question 7

A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?

A. 0.05 g/L

Correct B. 0.10 g/L

C. 0.20 g/L

D. 0.50 g/L

Correct Answer: B

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

Question 8

A metal alloy contains 80% copper and 20% zinc. If 100 g of the alloy is melted and cast into a ingot, what is the mass of copper in the ingot?

A. 50 g

Correct B. 60 g

C. 70 g

D. 80 g

Correct Answer: B

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

Question 9

A solution of HCl is prepared by dissolving 25 g of HCl in 100 mL of water. What is the concentration of the solution in M?

A. 0.25 M

B. 0.50 M

C. 0.75 M

Correct D. 1.00 M

Correct Answer: D

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

Question 10

A sample of air contains 20% O2, 30% N2, and 50% CO2. If 100 L of the air is collected, what is the volume of O2 in the sample?

Correct A. 20 L

B. 30 L

C. 40 L

D. 50 L

Correct Answer: A

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

Question 11

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

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 12

A 5.00 g sample of a non-metallic oxide is dissolved in 25.0 mL of water to give a solution with a pH of 3.00. Calculate the molar mass of the oxide.

A. 50.0 g/mol

B. 75.0 g/mol

Correct C. 100 g/mol

D. 125 g/mol

Correct Answer: C

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

Question 13

A 10.0 mL sample of a 0.100 M solution of a strong acid is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.0050 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 14

A 5.00 g sample of a non-metallic oxide is dissolved in 25.0 mL of water to give a solution with a pH of 3.00. Calculate the molar mass of the oxide.

A. 50.0 g/mol

B. 75.0 g/mol

Correct C. 100 g/mol

D. 125 g/mol

Correct Answer: C

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

Question 15

A 10.0 mL sample of a 0.100 M solution of a strong acid is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.0050 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 16

The reaction between chlorine gas and potassium iodide is represented by the equation: 2KI(s) + Cl2(g) → 2KCl(s) + I2(s). If 2.5 g of KI is reacted with an excess of Cl2, calculate the number of moles of I2 produced.

A. 0.25 mol

Correct B. 0.5 mol

C. 0.75 mol

D. 1.0 mol

Correct Answer: B

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

Question 17

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.5 g of carbon at 298 K.

Correct A. -589.25 kJ

B. -589.75 kJ

C. -590.25 kJ

D. -590.75 kJ

Correct Answer: A

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

Question 18

A 0.5 M solution of HCl is mixed with a 0.2 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete.

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 19

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is initially present, how much will remain after 20 years?

Correct A. 12.5 g

B. 25.0 g

C. 37.5 g

D. 50.0 g

Correct Answer: A

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

Question 20

A 2.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. Calculate the number of moles of NaHSO4 produced.

A. 0.5 mol

Correct B. 1.0 mol

C. 1.5 mol

D. 2.0 mol

Correct Answer: B

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

Question 21

The electrolysis of water produces hydrogen gas at the cathode and oxygen gas at the anode. If the electrolysis is carried out u\sing a current of 2.0 A for 2.0 hours, calculate the volume of hydrogen gas produced at STP.

A. 1.0 L

B. 2.0 L

Correct C. 4.0 L

D. 8.0 L

Correct Answer: C

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

Question 22

A polymer has the following structure: [-CH2-CH2-CH2-CH2-]n. What is the type of polymerization reaction that produced this polymer?

A. Condensation polymerization

Correct B. Addition polymerization

C. Ring-opening polymerization

D. Step-growth polymerization

Correct Answer: B

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

Question 23

The rate cons\tant 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 of the reac\tant after 10 minutes?

Correct A. 0.01 M

B. 0.05 M

C. 0.1 M

D. 0.2 M

Correct Answer: A

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

Question 24

The reaction of an alkene with bromine produces a dibromide. What is the type of reaction that occurred?

Correct A. Addition reaction

B. Elimination reaction

C. Substitution reaction

D. Oxidation reaction

Correct Answer: A

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

Question 25

The electrolysis of a solution of sulfuric acid produces hydrogen gas at the cathode and oxygen gas at the anode. If the electrolysis is carried out u\sing a current of 1.5 A for 1.5 hours, calculate the volume of oxygen gas produced at STP.

A. 0.5 L

B. 1.0 L

Correct C. 2.0 L

D. 4.0 L

Correct Answer: C

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