POST UTME COAL CITY UNIVERSITY 2020 Chemistry | Objective

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Question 1 View Details
A 0.1 M solution of a weak acid HA is mixed with 0.1 M NaOH. If the initial pH of the acid solution is 4.5, what is the pH after the reaction is complete?
A. 4.5
Correct B. 5.5
C. 6.5
D. 7.5

Correct Answer: B

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Question 2 View Details
The diagram below shows the titration curve of a weak acid HA with a strong base NaOH.
A. The equivalence point is at pH 7.
Correct B. The equivalence point is at pH 10.
C. The equivalence point is at pH 12.
D. The equivalence point is at pH 14.

Correct Answer: B

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Question 3 View Details
A metal M reacts with chlorine gas to form a white solid MX. If the molar mass of M is 40 g/mol and the molar mass of MX is 80 g/mol, what is the formula of MX?
A. MCl
Correct B. MCl2
C. MCl3
D. MCl4

Correct Answer: B

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Question 4 View Details
A 1.0 M solution of a salt MX is prepared by dissolving 36.5 g of MX in 100 mL of water. What is the molarity of the solution?
A. 0.5 M
Correct B. 1.0 M
C. 2.0 M
D. 3.0 M

Correct Answer: B

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Question 5 View Details
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 0.5 L
Correct B. 1.0 L
C. 2.0 L
D. 4.0 L

Correct Answer: B

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Question 6 View Details
Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in an aqueous solution.
Correct A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Condensation reaction

Correct Answer: A

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Question 7 View Details
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a strong base NaOH. If the initial pH of the acid solution is 3.0, what is the pH of the resulting solution after the reaction is complete?
A. 2.0
Correct B. 3.0
C. 4.0
D. 5.0

Correct Answer: B

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Question 8 View Details
A 2.0 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat energy. If the molar mass of the hydrocarbon is 42.0 g/mol, what is the heat of combustion per mole of the hydrocarbon?
A. -300 kJ/mol
B. -400 kJ/mol
Correct C. -500 kJ/mol
D. -600 kJ/mol

Correct Answer: C

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Question 9 View Details
A 0.1 M solution of a weak base B is mixed with a 0.1 M solution of a strong acid HCl. If the initial pOH of the base solution is 4.0, what is the pOH of the resulting solution after the reaction is complete?
A. 2.0
B. 3.0
Correct C. 4.0
D. 5.0

Correct Answer: C

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Question 10 View Details
A 1.0 M solution of a weak acid HA is mixed with a 1.0 M solution of a strong base NaOH. If the initial pH of the acid solution is 2.0, what is the pH of the resulting solution after the reaction is complete?
A. 1.0
B. 2.0
C. 3.0
Correct D. 4.0

Correct Answer: D

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Question 11 View Details
The reaction of magnesium with hydrochloric acid is represented by the equation: Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g). If 2.50 g of magnesium is reacted with 100 mL of 2.00 M hydrochloric acid, what is the limiting reac\tant?
A. Magnesium
Correct B. Hydrochloric acid
C. Both are in excess
D. Neither is in excess

Correct Answer: B

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Question 12 View Details
The s\tandard enthalpy of formation of CO2 (g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O (l) if the s\tandard enthalpy of formation of H2 (g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2 (g) is 0 kJ/mol?
Correct A. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -483.5 kJ/mol

Correct Answer: A

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Question 13 View Details
The diagram below represents the atomic structure of an atom. What is the name of the region where the electrons are most likely to be found?
A. Nucleus
Correct B. Electron cloud
C. Protons
D. Neutrons

Correct Answer: B

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Question 14 View Details
The reaction of sodium with water is represented by the equation: 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g). What is the volume of hydrogen gas produced at STP if 2.50 g of sodium is reacted with 100 mL of water?
A. 1.00 L
Correct B. 2.00 L
C. 3.00 L
D. 4.00 L

Correct Answer: B

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Question 15 View Details
The s\tandard enthalpy of formation of NH3 (g) is -45.9 kJ/mol. What is the s\tandard enthalpy of formation of N2 (g) if the s\tandard enthalpy of formation of H2 (g) is 0 kJ/mol?
Correct A. 0 kJ/mol
B. -45.9 kJ/mol
C. -90.9 kJ/mol
D. -135.9 kJ/mol

Correct Answer: A

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Question 16 View Details
The diagram below represents the structure of a hydrocarbon. What is the name of the functional group?
A. Alkane
Correct B. Alkene
C. Alkyne
D. Aromatic

Correct Answer: B

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Question 17 View Details
The reaction of calcium with oxygen is represented by the equation: 2Ca (s) + O2 (g) → 2CaO (s). What is the mass of calcium oxide produced if 2.50 g of calcium is reacted with 100 mL of oxygen?
A. 3.00 g
Correct B. 4.00 g
C. 5.00 g
D. 6.00 g

Correct Answer: B

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Question 18 View Details
The s\tandard enthalpy of formation of CO (g) is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O (l) if the s\tandard enthalpy of formation of H2 (g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2 (g) is 0 kJ/mol?
Correct A. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -483.5 kJ/mol

Correct Answer: A

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Question 19 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 20 View Details
What is the molar mass of a compound with the empirical formula C2H4O?
A. 28
B. 44
Correct C. 60
D. 72

Correct Answer: C

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Question 21 View Details
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 22 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 23 View Details
A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 24 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 25 View Details
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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