POST UTME BSU 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A metal has a density of 10 g/cm^3 and a volume of 10 cm^3. Calculate the mass of the metal.
A. 100 g
B. 200 g
C. 500 g
D. 1000 g
Question 2
Determine the pH of a 0.1 M solution of HCl if 25 mL of 1 M NaOH is added to 50 mL of the HCl solution.
A. 1
B. 2
C. 3
D. 4
Question 3
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, ΔHf(C) = 0 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.61 kJ/mol
C. -1206.59 kJ/mol
D. -1206.62 kJ/mol
Question 4
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 5
A sample of hydrogen gas (H2) is collected over water at a temperature of 298 K and a pressure of 1.00 atm. If the partial pressure of water vapor is 0.50 atm, what is the partial pressure of hydrogen gas?
A. 0.50 atm
B. 0.75 atm
C. 1.00 atm
D. 1.25 atm
Question 6
A solution of 0.10 M acetic acid (CH3COOH) is titrated with 0.20 M sodium hydroxide (NaOH). If 25.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the acetic acid?
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 7
A sample of a non-metallic oxide is analyzed and found to have a mass of 25.0 g. If the oxide has a molar mass of 80.0 g/mol, what is the number of moles of the oxide present?
A. 0.312 mol
B. 0.3125 mol
C. 0.3125 mol
D. 0.3125 mol
Question 8
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. Calculate the concentration of the resulting solution.
A. 1.00 M
B. 0.50 M
C. 0.25 M
D. 0.10 M
Question 9
A solution of acetic acid is prepared by dissolving 10.0 g of acetic acid in 100 mL of water. What is the pH of the solution?
A. 2.0
B. 2.5
C. 3.0
D. 3.5
Question 10
A polymer (P) has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?
A. 200 g/mol
B. 400 g/mol
C. 600 g/mol
D. 800 g/mol
Question 11
A solution contains 0.1 M HCl and 0.1 M NaOH. Determine the pH of the solution after mixing 50 mL of each solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 12
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. Write the balanced equation for this reaction.
A. Fe2+ + MnO4- → Fe3+ + Mn2+
B. Fe2+ + MnO4- → Fe3+ + MnO2
C. Fe2+ + MnO4- → Fe2+ + Mn2+
D. Fe3+ + MnO4- → Fe2+ + Mn2+
Question 13
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. Calculate the pH of the resulting solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
Determine the pH of a 0.1 M solution of HCl at 25°C. The dissociation cons\tant of HCl is 1.0 × 10^\( -7 \).
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 15
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance initially exists, how much will remain after 20.0 days?
A. 50.0 mg
B. 25.0 mg
C. 12.5 mg
D. 6.25 mg

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