POST UTME MADONNA UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The compound SO2 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5
Question 2
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 3
A metal is said to be in its s\tandard state when it is in its most stable form. Which of the following metals is in its s\tandard state?
A. Cu (s)
B. Zn (s)
C. Fe (s)
D. Ag (s)
Question 4
A 25.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100 mL
Question 5
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675.7 kJ/mol, and for Fe2O3(s) is -824.2 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and for Fe(s) is 0 kJ/mol.
A. -1369.9 kJ/mol
B. -1370.1 kJ/mol
C. -1369.5 kJ/mol
D. -1369.7 kJ/mol
Question 6
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 7
A redox reaction involves the transfer of electrons from one species to another. Which of the following is an example of a redox reaction?
A. 2Na (s) + Cl2 (g) → 2NaCl (s)
B. Ca (s) + 2HCl (aq) → CaCl2 (aq) + H2 (g)
C. Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)
D. H2 (g) + F2 (g) → 2HF (g)
Question 8
A solution contains 0.1 M $\text{H}_2\text{SO}_4$. What is the concentration of $\text{H}^+$ ions in the solution?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 9
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
The compound SO4 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5
Question 11
The compound SO2 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5
Question 12
A sample of a non-metallic element has a mass of 25 g and a volume of 5 cm³. What is the density of the element?
A. 5 g/cm³
B. 10 g/cm³
C. 15 g/cm³
D. 20 g/cm³
Question 13
A gas at a pressure of 1.0 atm and a temperature of 20°C is allowed to expand to a volume of 2.0 L. What is the new pressure of the gas?
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 14
A 2.5 M solution of HCl is titrated with a 1.0 M solution of NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 2.5
B. 2.6
C. 2.7
D. 2.8
Question 15
A 10.0 g sample of a non-metallic element is heated in a crucible until it reaches a temperature of 2500°C. The mass of the crucible and its contents is 12.5 g. Calculate the mass of the element that has sublimed.
A. 2.0 g
B. 2.5 g
C. 3.0 g
D. 3.5 g

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