POST UTME RHEMA UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the concentration of HCl that will remain in the solution?
A. 0.5 M
B. 0.25 M
C. 0.1 M
D. 0.05 M
Question 2
A 0.5 M solution of sodium hydroxide (NaOH) is titrated with a 0.5 M solution of hydrochloric acid (HCl). What is the pH of the solution after the reaction is complete?
A. 7
B. 8
C. 9
D. 10
Question 3
A mixture of 2.0 g of C6H14 and 3.0 g of C4H10 is burned in a bomb calorimeter. The heat of combustion of C6H14 is -3940 kJ/mol, and the heat of combustion of C4H10 is -2870 kJ/mol. What is the total heat of combustion of the mixture?
A. -7840 kJ
B. -6940 kJ
C. -5940 kJ
D. -4940 kJ
Question 4
Determine the molar solubility of CaF2 in 0.1 M NaF solution, given that the solubility product cons\tant (Ksp) for CaF2 is 3.9 × 10^-11.
A. 1.0 × 10^-4 M
B. 1.0 × 10^-5 M
C. 1.0 × 10^-6 M
D. 1.0 × 10^-7 M
Question 5
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the reac\tant and product?
A. Cu: +2, Cu: +2
B. Cu: +2, Cu: -2
C. Cu: -2, Cu: +2
D. Cu: +2, Cu: 0
Question 6
The reaction between sodium hydroxide and acetic acid is a classic example of a reaction that exhibits which of the following characteristics?
A. Endothermic
B. Exothermic
C. Neutralization
D. Oxidation-Reduction
Question 7
A sample of a gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 8
A 2.50 g sample of a polymer is dissolved in 100.0 mL of a solvent. The resulting solution has a vis\cosity of 1.50 cP. What is the molar mass of the polymer?
A. 1000 g/mol
B. 2000 g/mol
C. 3000 g/mol
D. 4000 g/mol
Question 9
A solution of 10 g of NaCl in 100 g of water has a boiling point elevation of 0.5°C. What is the molality of the solution?
A. 0.1 m
B. 0.5 m
C. 1 m
D. 2 m
Question 10
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
B. 6.00
C. 5.00
D. 4.00
Question 11
The reaction of methane with chlorine produces chloromethane and hydrogen chloride. Write the balanced chemical equation for this reaction.
A. CH4 + Cl2 → CH3Cl + HCl
B. CH4 + Cl2 → CH2Cl2 + H2
C. CH4 + Cl2 → CH3Cl + HCl + Cl2
D. CH4 + Cl2 → CH4Cl + HCl
Question 12
A 0.1 M solution of AgNO3 is mixed with a 0.1 M solution of NaCl. If the initial concentrations of Ag+ and Cl- are 0.1 M each, what is the concentration of AgCl that will precipitate out of the solution?
A. 1.8 x 10^-5 M
B. 1.8 x 10^-6 M
C. 1.8 x 10^-7 M
D. 1.8 x 10^-8 M
Question 13
A diagram of a redox reaction is shown below. What is the oxidation state of the element X?
A. +2
B. -2
C. 0
D. +1
Question 14
A sample of sulfur dioxide gas at 25°C and 1 atm is passed through a solution of sodium hydroxide. The reaction is as follows: SO2 + NaOH → NaHSO3. What is the limiting reac\tant if 2.0 g of SO2 is added to 100 g of 1 M NaOH?
A. SO2
B. NaOH
C. NaHSO3
D. H2O
Question 15
A polymer is made up of repeating units of the following structure: CH2=CH-CH2-CH2-CH2. What is the type of polymer?
A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polyester

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