POST UTME IGBINEDION UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1 L solution of sulfuric acid (H2SO4) is prepared by dissolving 98 g of H2SO4 in water. What is the molarity of the solution?
A. 1 M
B. 0.5 M
C. 0.2 M
D. 0.1 M
Question 2
The half-life of a radioactive subs\tance is 10 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 20 years?
A. 25
B. 50
C. 75
D. 100
Question 3
A 0.1 M solution of sodium carbonate (Na2CO3) is prepared by dissolving 2 g of Na2CO3 in water to make 1 L of solution. What is the concentration of the solution in g/L?
A. 20 g/L
B. 10 g/L
C. 5 g/L
D. 2 g/L
Question 4
A 0.1 M solution of a hydrocarbon, C6H14, has a density of 0.7 g/mL. Determine the molar mass of C6H14.
A. 70
B. 80
C. 90
D. 100
Question 5
The reaction of sodium hydroxide (NaOH) with ethanoic acid (CH3COOH) is a classic example of a redox reaction. What is the oxidation state of the carbon atom in the ethanoic acid molecule?
A. 0
B. -2
C. +2
D. +4
Question 6
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 7
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 40 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 8
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K, given that the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, and the rate of disappearance of NO is 0.05 M/s.
A. \( 2.5 \times 10^{-3} , \text{s}^{-1} \)
B. \( 5.0 \times 10^{-3} , \text{s}^{-1} \)
C. \( 1.0 \times 10^{-2} , \text{s}^{-1} \)
D. \( 2.0 \times 10^{-2} , \text{s}^{-1} \)
Question 9
A 2.00 L sample of a gas at 25°C is collected over water at 25°C. If the total pressure is 750 mmHg, what is the partial pressure of the gas?
A. 550 mmHg
B. 600 mmHg
C. 650 mmHg
D. 700 mmHg
Question 10
A 1 L solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in water. What is the molarity of the solution?
A. 1 M
B. 0.5 M
C. 0.2 M
D. 0.1 M
Question 11
Determine the number of moles of oxygen gas (O2) required to completely combust 2.50 moles of propane (C3H8) according to the balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O.
A. 0.50 mol
B. 1.25 mol
C. 2.50 mol
D. 5.00 mol
Question 12
A 2.50-g sample of a gas at 27°C and 1.00 atm is heated to 127°C at cons\tant volume. What is the new pressure of the gas?
A. 2.00 atm
B. 2.50 atm
C. 3.00 atm
D. 3.50 atm
Question 13
A 0.1 M solution of a weak acid, HA, has a pH of 4. Determine the value of Ka for HA.
A. 10^{-5}
B. 10^{-4}
C. 10^{-3}
D. 10^{-2}
Question 14
A 0.1 M solution of a salt, NaCl, has a pH of 7. Determine the value of Kb for NaOH.
A. 10^{-9}
B. 10^{-8}
C. 10^{-7}
D. 10^{-6}
Question 15
A reaction is carried out at cons\tant pressure. The reaction is exothermic and has a negative enthalpy change. Which of the following statements is true?
A. The reaction is spon\taneous.
B. The reaction is non-spon\taneous.
C. The reaction is at equilibrium.
D. The reaction is \endothermic.

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