POST UTME IGBINEDION UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas?
A. 1.01 x 10^5 Pa
B. 2.53 x 10^5 Pa
C. 3.01 x 10^5 Pa
D. 4.02 x 10^5 Pa
Question 2
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is added, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 3
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 4
Determine the concentration of a solution containing 25.0 mL of 0.1 M HCl diluted to 100.0 mL.
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 5
A polymer is formed by the condensation reaction between a diol and a diacid. If the molar mass of the diol is 90 g/mol and the molar mass of the diacid is 120 g/mol, and the reaction produces 2 moles of water per mole of polymer formed, what is the molar mass of the polymer?
A. 198 g/mol
B. 216 g/mol
C. 234 g/mol
D. 252 g/mol
Question 6
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 7
A redox reaction involves the oxidation of Fe^2+ to Fe^3+ and the reduction of MnO4^- to Mn^2+. What is the half-reaction for the oxidation of Fe^2+?
A. \text{Fe}^2+ \rightarrow \text{Fe}^3+ + \text{e}^-
B. \text{Fe}^3+ \rightarrow \text{Fe}^2+ + \text{e}^-
C. \text{Fe}^2+ + \text{e}^- \rightarrow \text{Fe}^3+
D. \text{Fe}^3+ + \text{e}^- \rightarrow \text{Fe}^2+
Question 8
A 50 mL sample of a 1.0 M solution of calcium chloride (CaCl2) is mixed with a 50 mL sample of a 1.0 M solution of sodium hydroxide (NaOH). 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 9
The half-life of a radioactive subs\tance is 5.0 years. If 100 g of the subs\tance is initially present, how much will remain after 20 years?
A. 6.25 g
B. 12.5 g
C. 25.0 g
D. 50.0 g
Question 10
Calculate the molar mass of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.
A. 12.0 g/mol
B. 24.0 g/mol
C. 36.0 g/mol
D. 48.0 g/mol
Question 11
The s\tandard reduction potential of the couple Zn2+/Zn is -0.76 V. If a zinc electrode is connected to a copper electrode with a s\tandard reduction potential of +0.34 V, what is the s\tandard cell potential?
A. -1.10 V
B. -0.42 V
C. +0.58 V
D. +1.18 V
Question 12
A sample of oxygen gas at 25°C and 1 atm is compressed to 5 atm. What is the new volume of the gas?
A. 1 L
B. 2 L
C. 5 L
D. 10 L
Question 13
A solution of 2 M HCl is mixed with a solution of 1 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 14
A 50 mL sample of a 1.0 M solution of potassium hydroxide (KOH) is mixed with a 50 mL sample of a 1.0 M solution of acetic acid (CH3COOH). 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 15
A diagram of a redox reaction is shown below. Identify the oxidizing agent.
A. Oxidizing Agent
B. Reducing Agent
C. Electron Donor
D. Electron Acceptor

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