POST UTME MADONNA UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of a weak base B(OH)3 is mixed with a 0.1 M solution of a strong acid HCl. If the initial volume of each solution is 100 mL, what is the pH of the resulting solution after complete neutralization?
A. \( pH = 7 \)
B. \( pH = 4 \)
C. \( pH = 6 \)
D. \( pH = 5 \)
Question 2
Determine the number of moles of $\text{O}_2$ that react with 2.50 moles of $\text{C}_2\text{H}_6$ according to the equation $\text{C}_2\text{H}_6 + \frac{7}{2}\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O}$.
A. 1.75 moles
B. 2.25 moles
C. 2.50 moles
D. 3.00 moles
Question 3
The s\tandard enthalpy of formation \( ΔH_f^\circ \) of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation \( ΔH_f^\circ \) of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 4
A solution of 0.1 M NaOH is prepared by dissolving 6.0 g of NaOH in 100 mL of water. What is the concentration of OH^- ions in the solution?
A. 0.1 M
B. 0.01 M
C. 0.001 M
D. 0.0001 M
Question 5
A 100 mL sample of a 0.1 M solution of NaOH is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. Calculate the initial volume of the acid in liters.
A. 0.05 L
B. 0.1 L
C. 0.2 L
D. 0.5 L
Question 6
The entropy change (ΔS) for a reaction is given by the equation ΔS = ΔH/T - ΔU. If the reaction is exothermic, what can be concluded about the sign of ΔH?
A. The sign of \u0394H is positive.
B. The sign of \u0394H is negative.
C. The sign of \u0394H is zero.
D. The sign of \u0394H is dep\endent on the temperature.
Question 7
A polymer is a long chain of repeating units called monomers. What is the name of the process by which a polymer is formed from its monomers?
A. Polymerization
B. Depolymerization
C. Condensation
D. Hydrolysis
Question 8
Calculate the pH of a 0.1 M solution of HCl after 10 mL of 0.1 M NaOH has been added to it.
A. 1
B. 2
C. 3
D. 4
Question 9
A 2.5 g sample of a subs\tance is dissolved in 25 mL of water. The resulting solution has a density of 1.2 g/mL. Calculate the molarity of the solution.
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 10
A 1.0 L solution contains 0.2 mol of NaCl. Calculate the concentration of Na+ ions in the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
A 2.5 g sample of a subs\tance is dissolved in 25 mL of water. The resulting solution has a density of 1.2 g/mL. Calculate the molarity of the solution.
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 12
A sample of a metal (M) reacts with hydrochloric acid (HCl) to produce a salt (MCl) and hydrogen gas (H2). What is the name of the reaction?
A. Single displacement reaction
B. Double displacement reaction
C. Combination reaction
D. Decomposition reaction
Question 13
The following diagram shows a titration setup. What is the purpose of the burette in this setup?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To filter the solution
Question 14
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a strong base NaOH. If the initial volume of each solution is 100 mL, what is the concentration of HA that will remain in the solution after complete neutralization?
A. (0.1) M
B. (0.05) M
C. (0.01) M
D. (0.001) M
Question 15
The diagram below shows a titration setup for determining the concentration of a strong acid.
A. pH 7
B. pH 10
C. pH 12
D. pH 14

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: