POST UTME RSU 2017 Chemistry | Objective

Prepare for your exams with POST UTME RSU questions? Reviewing past/model 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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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 View Details
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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