POST UTME IGBINEDION UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 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 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 5
A sample of a non-metallic oxide, X2O3, has a mass of 25.0 g and a volume of 2.50 L at 298 K. If the molar mass of X2O3 is 160 g/mol, calculate the partial pressure of X2O3 in the gas phase.
A. \( 1.25 \times 10^{2} , \text{kPa} \)
B. \( 2.50 \times 10^{2} , \text{kPa} \)
C. \( 3.75 \times 10^{2} , \text{kPa} \)
D. \( 5.00 \times 10^{2} , \text{kPa} \)
Question 6
A 2.00-g sample of a gas at 27°C and 1.00 atm is heated to 127°C at cons\tant pressure. What is the new volume of the gas?
A. 2.00 L
B. 2.50 L
C. 3.00 L
D. 3.50 L
Question 7
A solution of sodium chloride (NaCl) is prepared by dissolving 10 g of NaCl in 100 g of water. What is the concentration of the solution in g/L?
A. 0.1
B. 0.5
C. 1
D. 5
Question 8
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 9
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 10
The reaction between HCl and NaOH is represented by the equation: HCl + NaOH → NaCl + H2O. What is the limiting reac\tant if 25.0 mL of 0.100 M HCl is mixed with 25.0 mL of 0.100 M NaOH?
A. HCl
B. NaOH
C. NaCl
D. H2O
Question 11
A 1.00 L flask contains 0.100 M H2(g) and 0.200 M Cl2(g) at 298 K. If the reaction: H2(g) + Cl2(g) → 2HCl(g) is allowed to proceed until equilibrium is reached, calculate the equilibrium partial pressures of HCl.
A. \( P_{\text{HCl}} = 0.050 , \text{kPa} \)
B. \( P_{\text{HCl}} = 0.100 , \text{kPa} \)
C. \( P_{\text{HCl}} = 0.150 , \text{kPa} \)
D. \( P_{\text{HCl}} = 0.200 , \text{kPa} \)
Question 12
A 0.1 M solution of an alkanol, C3H7OH, has a boiling point of 78°C. Determine the molar mass of C3H7OH.
A. 60
B. 70
C. 80
D. 90
Question 13
A 0.500 L flask contains 0.100 M H2(g) and 0.200 M Cl2(g) at 298 K. If the reaction: H2(g) + Cl2(g) → 2HCl(g) is allowed to proceed until equilibrium is reached, calculate the equilibrium concentrations of H2 and Cl2.
A. \( [\text{H}_2] = 0.050 , \text{M}, , [\text{Cl}_2] = 0.100 , \text{M} \)
B. \( [\text{H}_2] = 0.100 , \text{M}, , [\text{Cl}_2] = 0.050 , \text{M} \)
C. \( [\text{H}_2] = 0.050 , \text{M}, , [\text{Cl}_2] = 0.050 , \text{M} \)
D. \( [\text{H}_2] = 0.100 , \text{M}, , [\text{Cl}_2] = 0.100 , \text{M} \)
Question 14
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 15
A sample of a gas at 25°C and 1 atm is heated to 50°C at cons\tant volume. What is the new pressure of the gas in atm?
A. 2 atm
B. 1 atm
C. 0.5 atm
D. 4 atm

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