POST UTME PAN-ATLANTIC UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.61 kJ/mol
C. -1206.59 kJ/mol
D. -1206.62 kJ/mol
Question 3
A 0.500 L flask contains 0.250 mol of CO2(g) at 298 K. Calculate the partial pressure of CO2 u\sing the ideal gas law.
A. 0.500 kPa
B. 0.750 kPa
C. 1.00 kPa
D. 1.25 kPa
Question 4
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 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
The reaction 2A + B → 3C is a redox reaction. If 2 moles of A and 1 mole of B are mixed, what is the limiting reac\tant?
A. A
B. B
C. Neither A nor B is the limiting reac\tant
D. The reaction is not a redox reaction
Question 7
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of 0.5 M H2SO4 solution.
A. 1 mole
B. 2 moles
C. 3 moles
D. 4 moles
Question 8
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 9
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 10
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. What is the purpose of the pipette?
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 11
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 12
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 13
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 14
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 hydrogen gas produced.
A. 0.5 moles
B. 1 mole
C. 1.5 moles
D. 2 moles
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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