POST UTME BELLS UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of sodium chloride (NaCl) is mixed with a 1.0 M solution of calcium chloride (CaCl2). What is the concentration of the resulting solution?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 2
A sample of copper metal is heated in a crucible to produce copper oxide. The reaction is represented by the equation:\[ \text{Cu} \xrightarrow{\Delta} \text{CuO} \]What is the oxidation state of copper in the product?
A. 2
B. 1
C. 0
D. -1
Question 3
The reaction between hydrogen gas (H2) and chlorine gas (Cl2) produces hydrochloric acid (HCl). Write the balanced chemical equation for this reaction.
A. 2H2 + Cl2 → 2HCl
B. H2 + Cl2 → HCl
C. 2HCl + Cl2 → H2
D. HCl + H2 → Cl2
Question 4
A solution of hydrochloric acid is prepared by dissolving 25.0 g of hydrochloric acid in 100 mL of water. What is the molarity of the solution?
A. 1.5 M
B. 2.5 M
C. 3.5 M
D. 4.5 M
Question 5
Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^\( -10 \) and the solubility product cons\tant (Ksp) for NaCl is 3.2 × 10^\( -9 \).
A. 1.0 × 10^\( -5 \) M
B. 1.5 × 10^\( -5 \) M
C. 2.0 × 10^\( -5 \) M
D. 2.5 × 10^\( -5 \) M
Question 6
A diagram of a gas collection apparatus is shown below.
A. The flask contains the gas.
B. The tube contains the gas.
C. The flask contains the liquid.
D. The tube contains the liquid.
Question 7
A metal rod of length 20 cm and cross-sectional area 1 cm^2 is heated from 20°C to 100°C. Calculate the change in length of the rod.
A. 0.2 cm
B. 0.4 cm
C. 0.6 cm
D. 0.8 cm
Question 8
The polymerization of styrene to polystyrene involves the addition of styrene monomers to form a long chain. Which of the following is the correct representation of the polymerization reaction?
A. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{polystyrene} \]
B. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{polymer} \]
C. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{monomer} \]
D. \[ \text{styrene} \xrightarrow{\text{initiator}} \text{dimer} \]
Question 9
A 1.0 M solution of hydrochloric acid (HCl) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 10
A 2.5 M solution of hydrochloric acid (HCl) is titrated with a 0.5 M solution of sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 12.5 mL
B. 25 mL
C. 50 mL
D. 100 mL
Question 11
A 2.0 M solution of acetic acid (CH3COOH) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). If 20 mL of NaOH is required to reach the equivalence point, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 12
In a redox reaction, what is the role of the catalyst in the Haber-Bosch process?
A. To increase the rate of reaction
B. To decrease the rate of reaction
C. To stabilize the reaction mixture
D. To facilitate the formation of nitrogen gas
Question 13
A 2.0 M solution of sodium chloride (NaCl) is mixed with a 1.0 M solution of calcium chloride (CaCl2). What is the concentration of the resulting solution?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 14
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. What is the reaction at the equivalence point?
A. NaOH + HCl → NaCl + H2O
B. NaOH + HCl → NaCl + H2O + NaOH
C. NaOH + HCl → NaCl + H2O + HCl
D. NaOH + HCl → NaCl + H2O + NaOH + HCl
Question 15
The reaction between sulfuric acid and sodium hydroxide is a classic example of a neutralization reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
A. H2SO4 + NaOH → Na2SO4 + H2O
B. H2SO4 + NaOH → NaHSO4 + H2O
C. H2SO4 + NaOH → Na2SO4 + H2
D. H2SO4 + NaOH → NaHSO4 + NaOH

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