POST UTME AL-HIKMAH UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 g sample of a non-metallic ha\logen is heated to produce a diatomic gas. The volume of the gas produced at STP is 1.5 L. What is the empirical formula of the ha\logen?
A. Cl2
B. Br2
C. I2
D. F2
Question 2
A sample of a metal (X) has a density of 8.5 g/cm^3 and a mass of 25 g. What is the volume of the sample?
A. 2.94 cm^3
B. 3.05 cm^3
C. 3.17 cm^3
D. 3.29 cm^3
Question 3
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the concentration of the solution
C. To measure the pH of the solution
D. To measure the temperature of the solution
Question 4
The diagram below shows a titration setup. 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 5
A 3.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The volume of CO2 produced at STP is 2.0 L. What is the mass of the metal oxide produced?
A. 3.6 g
B. 3.2 g
C. 3.0 g
D. 2.8 g
Question 6
The diagram below shows a chemical apparatus setup. What is the purpose of the condenser?
A. To cool the vapor
B. To heat the vapor
C. To separate the vapor from the liquid
D. To mix the vapor with the liquid
Question 7
A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the resulting pH?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 8
The environmental impact of a chemical reaction can be determined by its
A. Thermodynamic properties
B. Kinetic properties
C. Electrochemical properties
D. Spectroscopic properties
Question 9
A 2.5 g sample of a non-metallic oxide of nitrogen is decomposed by heating with graphite. The volume of nitrogen gas produced at STP is 2.5 L. What is the empirical formula of the oxide?
A. N2O
B. NO
C. N2O3
D. N2O5
Question 10
At 25°C, the equilibrium cons\tant (Kc) for the reaction N2O4(g) ⇌ 2NO2(g) is 0.061. If the initial concentrations of N2O4 and NO2 are 0.100 M and 0.000 M, respectively, calculate the equilibrium concentrations of N2O4 and NO2.
A. 0.050 M N2O4, 0.050 M NO2
B. 0.050 M N2O4, 0.100 M NO2
C. 0.100 M N2O4, 0.050 M NO2
D. 0.100 M N2O4, 0.100 M NO2
Question 11
A 5.0 g sample of a subs\tance is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. What is the molar heat of combustion of the subs\tance?
A. -2500 kJ/mol
B. -3000 kJ/mol
C. -3500 kJ/mol
D. -4000 kJ/mol
Question 12
A sample of a hydrocarbon has a molecular formula of C5H12. What is the type of hydrocarbon?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic
Question 13
A 1.0 M solution of H2SO4 is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) from the following reaction: H2(g) + 1/2O2(g) → H2O(l).
A. -285.8 kJ/mol
B. -286.8 kJ/mol
C. -287.8 kJ/mol
D. -288.8 kJ/mol
Question 15
A 0.500 M solution of HCl(aq) is titrated with a 0.500 M solution of NaOH(aq). If 25.0 mL of NaOH(aq) is required to reach the equivalence point, calculate the number of moles of HCl(aq) in 100.0 mL of the solution.
A. 0.00500 mol
B. 0.0100 mol
C. 0.0150 mol
D. 0.0200 mol

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