POST UTME LEAD CITY UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The half-life of a radioactive subs\tance is the time required for half of the initial amount of the subs\tance to decay. What is the unit of half-life?
A. s
B. min
C. h
D. d
Question 2
A 5.0 M solution of HNO3 is prepared by dissolving 25 g of HNO3 in 1000 mL of water. What is the concentration of H+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 1.0 M
D. 10 M
Question 3
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the unit of solubility?
A. g/L
B. mol/L
C. mL/g
D. g/mol
Question 4
A 5.0 M solution of HCl is prepared by dissolving 25 g of HCl in 1000 mL of water. What is the concentration of H+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 1.0 M
D. 10 M
Question 5
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the temperature dep\endence of the dissociation cons\tant is negligible.
A. 1
B. 2
C. 3
D. 4
Question 6
The reaction of sodium with water is highly exothermic and produces hydrogen gas. What is the balanced chemical equation for this reaction?
A. 2Na + 2H2O → 2NaOH + H2
B. 2Na + 2H2O → 2NaOH + 2H2
C. 2Na + 2H2O → 2NaOH + O2
D. 2Na + 2H2O → 2NaOH + 2O2
Question 7
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 8
A 2.0 M solution of NaOH is prepared by dissolving 20 g of NaOH in 1000 mL of water. What is the concentration of OH^\( - \) ions in the solution?
A. 0.01 M
B. 0.1 M
C. 1.0 M
D. 10 M
Question 9
A solution of NaOH is titrated with a solution of HCl. The initial pH of the NaOH solution is 12. The pH at the equivalence point is 7. Determine the concentration of the HCl solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 10
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the volume of the acid solution in liters?
A. 0.2 L
B. 0.1 L
C. 0.05 L
D. 0.01 L
Question 11
What is the pH of a 0.0500 M solution of HCl?
A. 0.0500
B. 1.00
C. 2.00
D. 3.00
Question 12
A 1.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the volume of the HCl solution in liters?
A. 0.2 L
B. 0.1 L
C. 0.05 L
D. 0.01 L
Question 13
The reaction of sodium with chlorine is an oxidation-reduction reaction. What is the balanced chemical equation for this reaction?
A. 2Na + Cl2 → 2NaCl
B. 2Na + Cl2 → 2NaCl + 2H2O
C. 2Na + Cl2 → 2NaCl + O2
D. 2Na + Cl2 → 2NaCl + 2O2
Question 14
A 2.0 L flask contains 0.5 M HCl. What is the concentration of H+ ions in the flask?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 15
A 10% solution of NaOH is prepared by dissolving 10 g of NaOH in 90 g of water. What is the concentration of OH^\( - \) ions in the solution?
A. 10% \( w/v \)
B. 20% \( w/v \)
C. 30% \( w/v \)
D. 40% \( w/v \)

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: