POST UTME RSU 2017 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 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the oxidation state of the underlined atom in the compound [Cr(H2O)6]Cl3.
Correct A. +3
B. +2
C. +1
D. 0

Correct Answer: A

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Question 2
A 25.0 mL sample of 0.100 M NaOH is mixed with a 50.0 mL sample of 0.0500 M HCl. What is the resulting pH?
A. 2.00
Correct B. 2.50
C. 3.00
D. 3.50

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
The reaction 2A(g) + 3B(g) → 5C(s) is a redox reaction. Identify the oxidizing agent.
A. A
Correct B. B
C. C
D. None of the above

Correct Answer: B

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Question 5
The rate cons\tant (k) for a first-order reaction is 0.0500 s^-1. If the initial concentration of the reac\tant is 0.100 M, what is the concentration after 2.00 minutes?
A. 0.0500 M
Correct B. 0.0750 M
C. 0.100 M
D. 0.125 M

Correct Answer: B

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Question 6
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 7
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the number of moles of H2SO4.
A. 0.25
Correct B. 0.5
C. 0.75
D. 1

Correct Answer: B

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Question 8
A metal X reacts with chlorine gas to form a white solid. The reaction is as follows: 2X + Cl2 → 2XCl. If 2.5 g of X reacts with 1.5 g of Cl2, calculate the molar mass of X.
A. 50
B. 75
Correct C. 100
D. 125

Correct Answer: C

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Question 9
A solution of NaOH is prepared by dissolving 10 g of NaOH in 100 mL of water. Calculate the molarity of the solution.
A. 0.1
B. 0.5
C. 1
Correct D. 2

Correct Answer: D

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Question 10
A 10 mL sample of 0.5 M HCl is titrated with 1 M NaOH. Calculate the number of moles of HCl.
A. 0.25
Correct B. 0.5
C. 0.75
D. 1

Correct Answer: B

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Question 11
Determine the s\tandard enthalpy of formation of cyclohexane (C6H12) from the s\tandard enthalpies of formation of its constituent elements.
Correct A. -123.0 kJ/mol
B. -123.5 kJ/mol
C. -124.0 kJ/mol
D. -124.5 kJ/mol

Correct Answer: A

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Question 12
A 0.500 M solution of NaOH is titrated with 0.500 M HCl. What is the pH of the solution after 25.0 mL of HCl has been added?
A. 2.00
B. 2.50
Correct C. 3.00
D. 3.50

Correct Answer: C

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Question 13
A colloidal solution of starch in water is added to a solution of iodine in water. What is the expected result?
A. The solution becomes blue.
B. The solution becomes colorless.
Correct C. The solution becomes purple.
D. The solution becomes yellow.

Correct Answer: C

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Question 14
A 2.00 M solution of K2Cr2O7 is reduced by adding 1.00 M H2SO4. What is the concentration of Cr3+ ions in the solution after the reaction is complete?
A. 0.500 M
B. 0.750 M
Correct C. 1.00 M
D. 1.25 M

Correct Answer: C

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Question 15
A catalyst is added to a reaction mixture containing 1.00 M H2 and 1.00 M O2. What is the expected effect on the reaction rate?
A. The reaction rate decreases.
Correct B. The reaction rate increases.
C. The reaction rate remains unchanged.
D. The reaction rate becomes zero.

Correct Answer: B

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Question 16
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 17
A diagram of a titration setup is shown below. What is the concentration of the NaOH solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 18
Calculate the molar mass of a compound with the following empirical formula: CH2O.
A. 30 g/mol
B. 60 g/mol
Correct C. 90 g/mol
D. 120 g/mol

Correct Answer: C

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Question 19
A diagram of a gas law experiment is shown below. What is the effect of increa\sing the temperature on the volume of the gas?
A. Volume decreases
Correct B. Volume increases
C. Volume remains cons\tant
D. Volume becomes zero

Correct Answer: B

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Question 20
Calculate the concentration of a solution containing 25 g of glu\cose in 250 mL of water.
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 21
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 22
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 23
A 10.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 10.0 mL of NaOH?
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 24
A 20.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 20.0 mL of NaOH?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 25
A 15.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 15.0 mL of NaOH?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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