POST UTME CRAWFORD UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the pH of a 0.1 M solution of HCl in water at 25°C, given that the dissociation cons\tant of HCl is 1.0 × 10^\( -7 \) and the ion product cons\tant of water is 1.0 × 10^\( -14 \).
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 2
A mixture of 2.0 g of C6H12O6 and 3.0 g of C2H5OH is heated to produce a product. What is the empirical formula of the product?
A. C5H10O
B. C6H12O
C. C7H14O
D. C8H16O
Question 3
A 10.0 mL sample of a solution contains 0.5 g of NaCl. What is the concentration of Na+ ions?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 4
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 5
Determine the molar solubility of BaSO4 in 0.1 M Na2SO4 solution.
A. 1.0 x 10^-3 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-5 M
D. 1.0 x 10^-6 M
Question 6
A solution contains 0.1 M NaCl and 0.1 M Na2SO4. What is the concentration of Cl- ions?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 7
A 2.5 L flask contains 0.5 mol of CO2 at 298 K. Calculate the partial pressure of CO2.
A. 1.0 x 10^2 kPa
B. 1.0 x 10^3 kPa
C. 1.0 x 10^4 kPa
D. 1.0 x 10^5 kPa
Question 8
The reaction between H2O2 and MnO2 is given by the equation: 2H2O2 + MnO2 → MnO4^\( - \) + 2H2O. What is the oxidation state of Mn in MnO4^\( - \)?
A. +4
B. +5
C. +6
D. +7
Question 9
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 250 g/mol
B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol
Question 10
A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. What is the partial pressure of O2 in a sample of air at 1 atm?
A. 0.2 atm
B. 0.4 atm
C. 0.6 atm
D. 0.8 atm

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