POST UTME MADONNA UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The rate of a chemical reaction is affected by the concentration of the reac\tants. Which of the following is a correct statement about the effect of concentration on the rate of a reaction?
A. Increa\sing the concentration of the reac\tants decreases the rate of the reaction.
B. Increa\sing the concentration of the reac\tants increases the rate of the reaction.
C. Decrea\sing the concentration of the reac\tants decreases the rate of the reaction.
D. Decrea\sing the concentration of the reac\tants increases the rate of the reaction.
Question 2
What is the major product of the reaction between 2-methylpropene and HBr?
A. 2-bromo-2-methylpropane
B. 2-bromo-2-methylbu\tane
C. 2-bromo-3-methylbu\tane
D. 2-bromo-2-methylpen\tane
Question 3
A 5 L flask contains 0.05 M $\text{NaOH}$. What is the concentration of $\text{OH}^-$ ions in the solution?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 4
The compound SO5 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 5
The solubility product cons\tant (Ksp) for AgCl is 1.8 x 10^-10. Calculate the molar solubility of AgCl.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M
Question 6
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
Question 7
A solution of HCl is mixed with a solution of NaOH. What is the resulting solution?
A. NaCl(aq)
B. H2O(l)
C. NaOH(aq)
D. HCl(aq)
Question 8
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 9
A diagram of a titration apparatus is shown below. If the burette contains 25.0 mL of 0.500 M HCl, and the initial pH of the solution is 3.00, what is the pH of the solution after 10.0 mL of 0.100 M NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A diagram of a titration apparatus is shown below. If the burette contains 25.0 mL of 1.0 M NaOH and the reaction is as follows: HCl + NaOH → NaCl + H2O, what is the concentration of the HCl solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
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
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 13
Determine the number of moles of $\text{O}_2$ that react with 2.5 g of $\text{Fe}_2\text{O}_3$ according to the equation $4\text{Fe}_2\text{O}_3 + 30\text{O}_2 \rightarrow 4\text{Fe}_3\text{O}_4$.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 14
A 2.5 L flask contains 0.1 M $\text{HCl}$. What is the concentration of $\text{H}^+$ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 15
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the reac\tant and product?
A. Cu(II) in reac\tant and Cu(0) in product
B. Cu(0) in reac\tant and Cu(II) in product
C. Cu(II) in reac\tant and Cu(II) in product
D. Cu(0) in reac\tant and Cu(0) in product

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