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POST UTME UNIPORT 2017 Chemistry | Objective

Are you preparing for POST UTME UNIPORT 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.

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Question 1

Determine the oxidation state of the central atom in the compound [Cr(H2O)6]Cl2.

Correct A. +3

B. +2

C. +6

D. +1

Correct Answer: A

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Question 2

A 2.5-L flask contains 0.15 mol of an ideal gas at 27°C. Calculate the pressure of the gas, assuming it obeys the ideal gas law.

A. 1.1 atm

Correct B. 1.2 atm

C. 1.3 atm

D. 1.4 atm

Correct Answer: B

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Question 3

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Erlenmeyer Flask

Correct Answer: A

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Question 4

A 2.0-L flask contains 0.50 mol of an ideal gas at 37°C. Calculate the number of moles of gas that would be present in a 1.0-L flask at 27°C, assuming the gas obeys the ideal gas law.

A. 0.25 mol

Correct B. 0.30 mol

C. 0.35 mol

D. 0.40 mol

Correct Answer: B

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Question 5

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Erlenmeyer Flask

Correct Answer: A

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Question 6

At 298 K, the s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -111.6 kJ/mol. Calculate the equilibrium cons\tant (K) for this reaction.

Correct A. 1.8 × 10^10

B. 1.8 × 10^5

C. 1.8 × 10^2

D. 1.8 × 10^-2

Correct Answer: A

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Question 7

A 2.5 L flask contains 0.15 mol of an ideal gas at 298 K. Calculate the pressure of the gas in the flask.

Correct A. 1.2 × 10^5 Pa

B. 1.2 × 10^4 Pa

C. 1.2 × 10^3 Pa

D. 1.2 × 10^2 Pa

Correct Answer: A

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Question 8

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mol of CO(g).

Correct A. -282.5 kJ/mol

B. -282.5 kJ/mol

C. -282.5 kJ/mol

D. -282.5 kJ/mol

Correct Answer: A

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Question 9

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

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 10

A 2.5 L flask contains 0.15 mol of an ideal gas at 298 K. Calculate the pressure of the gas in the flask.

Correct A. 1.2 × 10^5 Pa

B. 1.2 × 10^4 Pa

C. 1.2 × 10^3 Pa

D. 1.2 × 10^2 Pa

Correct Answer: A

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Question 11

A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C at cons\tant pressure, what is the new volume of the gas?

Correct A. 3.125 L

B. 4.166 L

C. 5.0 L

D. 6.25 L

Correct Answer: A

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Question 12

A solution contains 5.0 g of NaCl. If 25.0 mL of 0.1 M HCl is added to the solution, what is the new concentration of the solution?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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Question 13

A polymer has a molecular weight of 50,000 g/mol. If 2.0 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution?

A. 0.1 M

B. 0.2 M

Correct C. 0.5 M

D. 1.0 M

Correct Answer: C

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Question 14

A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. If the pressure is increased to 2 atm at cons\tant temperature, what is the new volume of the gas?

A. 1.25 L

Correct B. 1.875 L

C. 2.5 L

D. 3.125 L

Correct Answer: B

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Question 15

A solution contains 10.0 g of glu\cose. If 50.0 mL of 0.2 M NaOH is added to the solution, what is the new concentration of the solution?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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Question 16

The reaction between chlorine gas and sodium hydroxide solution produces a compound with the formula NaClO. What is the oxidation state of chlorine in this compound?

A. 0

B. -1

Correct C. +1

D. +2

Correct Answer: C

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Question 17

A 2.5 L flask contains a mixture of nitrogen and oxygen gases at a total pressure of 2.0 atm. If the mole \fraction of nitrogen is 0.6, what is the partial pressure of oxygen?

Correct A. 0.8 atm

B. 1.0 atm

C. 1.2 atm

D. 1.5 atm

Correct Answer: A

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Question 18

The compound C6H12O6 is a sugar that can be oxidized to form a compound with the formula C6H12O6. What is the oxidation state of carbon in this compound?

A. +2

B. +3

Correct C. +4

D. +5

Correct Answer: C

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Question 19

A 100 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the reaction is complete?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 20

A 2.0 L flask contains a mixture of nitrogen and oxygen gases at a total pressure of 2.5 atm. If the mole \fraction of oxygen is 0.4, what is the partial pressure of nitrogen?

A. 1.0 atm

Correct B. 1.2 atm

C. 1.5 atm

D. 2.0 atm

Correct Answer: B

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Question 21

Determine the pH of a 0.1 M solution of HCl at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 22

A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MX2. If 2.5 g of M reacts with 1.5 g of Cl2, what is the percentage yield of the reaction?

A. 50%

B. 60%

Correct C. 70%

D. 80%

Correct Answer: C

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Question 23

A solution of NaOH is added to a solution of HCl. The resulting solution is a salt and water. What is the pH of the resulting solution?

A. 1

B. 2

Correct C. 7

D. 14

Correct Answer: C

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Question 24

A diagram of a titration apparatus 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 temperature of the solution

D. To measure the density of the solution

Correct Answer: A

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Question 25

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 cool the reac\tants

D. To filter the reac\tants

Correct Answer: A

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