POST UTME MADONNA UNIVERSITY 2017 Chemistry | Objective

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Question 1
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 2
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the acid
Correct B. To measure the volume of the base
C. To measure the pH of the solution
D. To measure the temperature of the solution

Correct Answer: B

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Question 3
A metal reacts with oxygen to form a basic oxide. Which of the following metals is likely to form a basic oxide?
Correct A. Aluminum
B. Copper
C. Zinc
D. Iron

Correct Answer: A

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Question 4
A diagram of a hydrocarbon molecule is shown below. What is the molecular formula of the hydrocarbon?
Correct A. C2H4
B. C2H6
C. C3H6
D. C3H8

Correct Answer: A

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Question 5
A solution of NaOH is added to a solution of HCl. What is the resulting solution?
Correct A. A solution of NaCl
B. A solution of NaOH
C. A solution of HCl
D. A solution of water

Correct Answer: A

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Question 6
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen peroxide (H2O2) decompose according to the equation: 2H2O2(l) → 2H2O(l) + O2(g).
Correct A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles

Correct Answer: A

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Question 7
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 8
The rate cons\tant (k) 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 after 10 minutes?
A. 0.01 M
Correct B. 0.05 M
C. 0.1 M
D. 0.2 M

Correct Answer: B

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Question 9
A sample of a gas has a volume of 2.5 L at a pressure of 1 atm and a temperature of 20°C. What is the volume of the gas at a pressure of 3 atm and a temperature of 50°C?
A. 1 L
B. 2 L
Correct C. 3 L
D. 4 L

Correct Answer: C

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Question 10
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 30 mL of NaOH has been added?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 11
A 0.500 M solution of NaCl is prepared by dissolving 25.0 g of NaCl in enough water to make 1.00 L of solution. What is the molarity of the solution?
Correct A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M

Correct Answer: A

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Question 12
A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl in enough water to make 1.00 L of solution. What is the molarity of the solution?
Correct A. 2.00 M
B. 2.50 M
C. 3.00 M
D. 3.50 M

Correct Answer: A

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Question 13
A 1.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in enough water to make 1.00 L of solution. What is the molarity of the solution?
Correct A. 1.00 M
B. 1.25 M
C. 1.50 M
D. 1.75 M

Correct Answer: A

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Question 14
A 2.00 M solution of H2SO4 is prepared by dissolving 60.0 g of H2SO4 in enough water to make 1.00 L of solution. What is the molarity of the solution?
Correct A. 2.00 M
B. 2.50 M
C. 3.00 M
D. 3.50 M

Correct Answer: A

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Question 15
A 1.00 M solution of Na2CO3 is prepared by dissolving 60.0 g of Na2CO3 in enough water to make 1.00 L of solution. What is the molarity of the solution?
Correct A. 1.00 M
B. 1.25 M
C. 1.50 M
D. 1.75 M

Correct Answer: A

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Question 16
Determine the s\tandard potential of the cell represented by the following reaction: MnO4- (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (l).
Correct A. -1.51 V
B. -1.23 V
C. -1.68 V
D. -1.93 V

Correct Answer: A

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Question 17
A 0.500 M solution of NaOH is titrated with 0.500 M HCl. Calculate the pH of the solution after the addition of 25.0 mL of HCl.
A. 2.00
Correct B. 3.00
C. 4.00
D. 5.00

Correct Answer: B

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Question 18
A sample of gas occupies 2.50 L at 25.0°C and 1.00 atm. Calculate the volume of the gas at 50.0°C and 2.00 atm.
A. 4.00 L
B. 5.00 L
Correct C. 6.00 L
D. 7.00 L

Correct Answer: C

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Question 19
A 2.00 g sample of a subs\tance is found to have a mass of 2.50 g when placed in a 10.0 mL solution of 0.500 M NaOH. Calculate the molar mass of the subs\tance.
A. 20.0 g/mol
B. 30.0 g/mol
Correct C. 40.0 g/mol
D. 50.0 g/mol

Correct Answer: C

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Question 20
A 1.00 L sample of a gas at 25.0°C and 1.00 atm is found to have a pressure of 2.00 atm at 50.0°C. Calculate the volume of the gas at 25.0°C and 1.00 atm.
Correct A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L

Correct Answer: A

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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. Calculate the number of moles of HCl required.
A. 0.0125
Correct B. 0.0250
C. 0.0375
D. 0.0500

Correct Answer: B

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Question 23
A 10.0 mL sample of 0.200 M H2SO4 is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 24
A 20.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. Calculate the number of moles of NaOH required.
A. 0.0125
Correct B. 0.0250
C. 0.0375
D. 0.0500

Correct Answer: B

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Question 25
A 15.0 mL sample of 0.200 M H2SO4 is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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