POST UTME NILE UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME NILE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas in the flask.
A. 1.01 x 10^5 Pa
Correct B. 2.02 x 10^5 Pa
C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa

Correct Answer: B

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Question 2
A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 3
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 50 mL of HCl has been added?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 4
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas in the flask.
A. 1.01 x 10^5 Pa
Correct B. 2.02 x 10^5 Pa
C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa

Correct Answer: B

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Question 5
A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 6
Determine the s\tandard enthalpy of formation of NH3(g) from the following data: ΔHf(NH3(g)) = -46.1 kJ/mol, ΔHf(H2(g)) = 0 kJ/mol, ΔHf(N2(g)) = 0 kJ/mol.
A. -46.1 kJ/mol
Correct B. -92.2 kJ/mol
C. -46.2 kJ/mol
D. -92.1 kJ/mol

Correct Answer: B

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Question 7
A 2.50 L flask contains 0.250 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^3 Pa
Correct B. 2.01 x 10^3 Pa
C. 3.01 x 10^3 Pa
D. 4.01 x 10^3 Pa

Correct Answer: B

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Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of CO(g).
Correct A. -393.5 kJ/mol
B. -393.0 kJ/mol
C. -392.5 kJ/mol
D. -392.0 kJ/mol

Correct Answer: A

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Question 9
A 1.00 L flask contains 0.500 mol of an ideal gas at 300 K. Calculate the volume of the gas at 400 K u\sing Charles' Law.
A. 1.50 L
B. 1.75 L
Correct C. 2.00 L
D. 2.25 L

Correct Answer: C

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Question 10
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of vaporization of 1.00 mol of H2O(l).
A. -40.7 kJ/mol
Correct B. -41.7 kJ/mol
C. -42.7 kJ/mol
D. -43.7 kJ/mol

Correct Answer: B

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Question 11
Determine the number of moles of H2O produced when 2.5 moles of CH4 react with excess O2 according to the equation: CH4 + 2O2 → CO2 + 2H2O.
Correct A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles

Correct Answer: A

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Question 12
A sample of CO2 gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased to 300 K, what is the new volume of the gas?
A. 3.75 L
Correct B. 4.5 L
C. 5.25 L
D. 6.0 L

Correct Answer: B

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Question 13
A solution contains 2.0 g of NaCl per 100 mL of water. What is the molarity of the 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 14
A 2.0 L sample of H2O contains 1.0 g of NaCl. What is the concentration of NaCl in the solution?
A. 0.5 g/L
Correct B. 1.0 g/L
C. 1.5 g/L
D. 2.0 g/L

Correct Answer: B

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Question 15
A 1.0 L sample of H2O contains 2.0 g of NaCl. What is the concentration of NaCl in the solution?
A. 1.0 g/L
Correct B. 2.0 g/L
C. 3.0 g/L
D. 4.0 g/L

Correct Answer: B

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Question 16
A mixture of 1.5 g of NaCl and 2.5 g of KNO3 is dissolved in 100 mL of water. Calculate the molarity of the solution.
A. 0.04 M
Correct B. 0.08 M
C. 0.12 M
D. 0.16 M

Correct Answer: B

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Question 17
A 2.5 L container is filled with a gas at 25°C and 1 atm. If the gas is heated to 50°C at cons\tant volume, what is the new pressure?
A. 2 atm
Correct B. 3 atm
C. 4 atm
D. 5 atm

Correct Answer: B

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Question 18
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 19
A 2.5 g sample of a subs\tance is dissolved in 100 mL of water. If the molarity of the solution is 0.5 M, what is the molar mass of the subs\tance?
A. 50 g/mol
Correct B. 100 g/mol
C. 150 g/mol
D. 200 g/mol

Correct Answer: B

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Question 20
A 1.5 L container is filled with a gas at 25°C and 1 atm. If the gas is compressed to 0.5 L at cons\tant temperature, what is the new pressure?
A. 2 atm
B. 3 atm
C. 4 atm
Correct D. 5 atm

Correct Answer: D

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Question 21
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 22
A 2.5 g sample of a subs\tance is dissolved in 100 mL of water. If the molarity of the solution is 0.5 M, what is the molar mass of the subs\tance?
A. 50 g/mol
Correct B. 100 g/mol
C. 150 g/mol
D. 200 g/mol

Correct Answer: B

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Question 23
A 1.5 L container is filled with a gas at 25°C and 1 atm. If the gas is compressed to 0.5 L at cons\tant temperature, what is the new pressure?
A. 2 atm
B. 3 atm
C. 4 atm
Correct D. 5 atm

Correct Answer: D

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Question 24
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4

Correct Answer: VIEW ANSWER

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Question 25
A sample of an ideal gas at 27°C and 1 atm is heated to 127°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?
A. 1:1
Correct B. 2:1
C. 3:1
D. 4:1

Correct Answer: B

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