POST UTME PAN-ATLANTIC UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of CO2 at 25°C and 1 atm is collected over water at 25°C and 1 atm. Calculate the partial pressure of CO2.
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.25 atm
Question 2
A 25 mL sample of 0.5 M H2SO4 is mixed with 25 mL of 0.5 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 3
A 2.50 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^2 kPa
B. 1.01 x 10^3 kPa
C. 1.01 x 10^4 kPa
D. 1.01 x 10^5 kPa
Question 4
A 25.0 g sample of a metal oxide is heated in a crucible until it decomposes completely. The mass of the metal obtained is 16.0 g. If the metal oxide has a molar mass of 120.0 g/mol, what is the empirical formula of the metal oxide?
A. MgO
B. CaO
C. Fe2O3
D. CuO
Question 5
A solution of $CuSO_4$ is electrolyzed u\sing a platinum electrode. The cathode reaction is:
A. Cu + SO_4^{2-}
B. Cu^2+ + SO_4^{2-}
C. Cu + 2H^+
D. Cu + 2OH^-
Question 6
A 2.5 L sample of 0.5 M H2SO4 solution is electrolyzed. If the electrolysis is carried out for 2 hours, and the current is 2 A, calculate the number of moles of oxygen gas produced.
A. 0.5 moles
B. 1 mole
C. 1.5 moles
D. 2 moles
Question 7
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 8
The reaction of an alkene with a ha\logen to form an alkyl halide is an example of a(n) _______________________ reaction.
A. substitution
B. elimination
C. addition
D. polymerization
Question 9
A 1.00 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the volume of the gas u\sing the ideal gas law.
A. 0.500 L
B. 1.00 L
C. 1.50 L
D. 2.00 L
Question 10
A 100 mL sample of 0.1 M HCl is mixed with 100 mL of 0.1 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 11
The reaction of a polymer with a monomer to form a new polymer is an example of a(n) _______________________ reaction.
A. polymerization
B. depolymerization
C. cross-linking
D. catalysis
Question 12
Determine the number of moles of H2 gas produced when 2.5 liters of H2 at 27°C and 1.2 atm is collected over water at 25°C and 1 atm.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1 mol
Question 13
A solution of $CuSO_4$ is electrolyzed u\sing a platinum electrode. The anode reaction is:
A. Cu + SO_4^{2-}
B. Cu^2+ + SO_4^{2-}
C. Cu + 2H^+
D. Cu + 2OH^-
Question 14
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 15
The reaction of a non-metal with oxygen to form an oxide is an example of a(n) _______________________ reaction.
A. combustion
B. oxidation
C. reduction
D. neutralization

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