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POST UTME RSU 2018 Chemistry | Objective

Are you preparing for POST UTME RSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 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. 7

Correct B. 2

C. 10

D. 14

Correct Answer: B

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Question 2

A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?

A. 7

Correct B. 2

C. 10

D. 14

Correct Answer: B

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Question 3

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

A. 101325 Pa

Correct B. 202650 Pa

C. 303875 Pa

D. 405100 Pa

Correct Answer: B

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Question 4

A diagram of a simple electric circuit is shown below. If a 9 V battery is connected to a 2 Ω resistor, what is the current flowing through the circuit?

A. 0.45 A

Correct B. 0.9 A

C. 1.35 A

D. 1.8 A

Correct Answer: B

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Question 5

A 0.5 mol sample of CO2 is placed in a 1 L flask at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 101325 Pa

Correct B. 202650 Pa

C. 303875 Pa

D. 405100 Pa

Correct Answer: B

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Question 6

A 2.50-g sample of a metal oxide is heated in a crucible until it decomposes completely. The mass of the metal obtained is 1.25 g. If the metal oxide has a molar mass of 120 g/mol and the metal has a molar mass of 40 g/mol, calculate the percentage yield of the metal.

A. 50%

B. 60%

Correct C. 70%

D. 80%

Correct Answer: C

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Question 7

A solution of HCl is electrolyzed u\sing a platinum electrode. The reaction at the anode is 2H2O → O2 + 4H+ + 4e-.

Correct A. 2H2O → O2 + 4H+ + 4e-

B. 2H2O → 2H2 + O2

C. 2H2O → H2 + 2OH-

D. 2H2O → H2O2 + 2H+

Correct Answer: A

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Question 8

A catalyst is added to a reaction mixture. The reaction rate increases by a factor of 5. If the initial rate of reaction is 2.5 mol/L·s, what is the new rate of reaction?

A. 1.25 mol/L·s

B. 2.5 mol/L·s

Correct C. 5 mol/L·s

D. 12.5 mol/L·s

Correct Answer: C

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Question 9

A sample of a gas at 25°C and 1 atm is compressed to 5 atm. What is the new volume of the gas?

A. 0.2 L

B. 0.5 L

Correct C. 1 L

D. 2 L

Correct Answer: C

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Question 10

A metal has an atomic radius of 100 pm and a metallic radius of 250 pm. What is the percentage increase in the metallic radius compared to the atomic radius?

A. 50%

B. 60%

Correct C. 70%

D. 80%

Correct Answer: C

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Question 11

Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4), 20% polypropylene (C3H6), and 20% polystyrene (C8H8).

A. 60 g/mol

Correct B. 120 g/mol

C. 180 g/mol

D. 240 g/mol

Correct Answer: B

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Question 12

A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.

A. 0.00250 mol

Correct B. 0.00500 mol

C. 0.00750 mol

D. 0.0100 mol

Correct Answer: B

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Question 13

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

Correct A. Burette

B. Beaker

C. Conical flask

D. Pipette

Correct Answer: A

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Question 14

A 2.50 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 1.25 g. Calculate the percentage of oxygen in the original sample.

A. 20.0%

B. 30.0%

Correct C. 40.0%

D. 50.0%

Correct Answer: C

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Question 15

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

Correct A. Burette

B. Beaker

C. Conical flask

D. Pipette

Correct Answer: A

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Question 16

The solubility of a subs\tance in water is determined by its

A. molecular weight

Correct B. intermolecular forces

C. electrostatic forces

D. van der Waals forces

Correct Answer: B

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Question 17

The rate cons\tant of a reaction is affected by

Correct A. temperature

B. concentration of reac\tants

C. surface area of catalyst

D. pressure of reac\tants

Correct Answer: A

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Question 18

The periodic table is arranged in order of

Correct A. atomic number

B. atomic mass

C. electronegativity

D. ionization energy

Correct Answer: A

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Question 19

The bond order of a molecule is determined by

Correct A. number of electrons in bonding orbitals

B. number of electrons in antibonding orbitals

C. number of electrons in molecular orbitals

D. number of electrons in atomic orbitals

Correct Answer: A

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Question 20

The pH of a solution is determined by

Correct A. concentration of hydrogen ions

B. concentration of hydroxide ions

C. concentration of acid

D. concentration of base

Correct Answer: A

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Question 21

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

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Question 22

The diagram below shows a chemical apparatus setup. What is the purpose of the condenser?

Correct A. to cool the vapor

B. to heat the vapor

C. to separate the vapor from the liquid

D. to mix the vapor with the liquid

Correct Answer: A

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Question 23

The diagram below shows a chemical reaction. What is the type of reaction?

Correct A. synthesis reaction

B. decomposition reaction

C. replacement reaction

D. combustion reaction

Correct Answer: A

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Question 24

The diagram below shows a chemical apparatus setup. What is the purpose of the filter paper?

A. to separate the solid from the liquid

B. to mix the solid with the liquid

C. to heat the liquid

D. to cool the liquid

Correct Answer: VIEW ANSWER

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Question 25

A sample of a metal oxide is heated in a crucible. The resulting gas is collected over water and found to have a volume of 2.5 L at 25°C. If the atmospheric pressure is 1.01 x 10^5 Pa, calculate the number of moles of the gas collected.

A. 0.05 mol

Correct B. 0.1 mol

C. 0.15 mol

D. 0.2 mol

Correct Answer: B

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