POST UTME AL-HIKMAH UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25% solution of glu\cose in water is to be diluted to 10% solution by adding 250 mL of water. Calculate the initial volume of the glu\cose solution.
A. 100 mL
B. 200 mL
C. 300 mL
D. 400 mL
Question 2
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 20 mL of HCl has been added?
A. 7.0
B. 8.0
C. 9.0
D. 10.0
Question 3
A 0.1 M solution of HCl is prepared by dissolving 2.5 g of HCl in 100 mL of water. If the density of the solution is 1.05 g/mL, what is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
A 1.0 M solution of FeCl3 is electrolyzed at a cons\tant current of 2.0 A for 10 minutes. What is the mass of Cl2 gas collected?
A. 0.5 g
B. 1.0 g
C. 1.5 g
D. 2.0 g
Question 5
A solution of 1.00 M sodium chloride is mixed with a solution of 2.00 M calcium chloride. What is the resulting concentration of calcium ions?
A. 0.50 M
B. 1.00 M
C. 1.50 M
D. 2.00 M
Question 6
The reaction between sodium and chlorine produces a white solid. If 2.50 g of sodium reacts with 1.50 g of chlorine, what is the limiting reac\tant?
A. sodium
B. chlorine
C. neither
D. both
Question 7
A 25.0 g sample of a metal (M) is heated in a crucible until it melts. The mass of the crucible and the metal is 25.5 g. The mass of the crucible alone is 10.0 g. What is the molar mass of the metal (M)?
A. 50.0 g/mol
B. 60.0 g/mol
C. 70.0 g/mol
D. 80.0 g/mol
Question 8
A metal oxide, M2O3, has a molar mass of 228 g/mol. If 2.5 g of the oxide is dissolved in 100 mL of water, what is the concentration of the solution in terms of molarity?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 9
A 2.00 M solution of sodium hydroxide (NaOH) is titrated with a 1.00 M solution of hydrochloric acid (HCl). If 25.0 mL of the HCl solution is required to reach the equivalence point, what is the volume of the NaOH solution required to reach the equivalence point?
A. 50.0 mL
B. 75.0 mL
C. 100.0 mL
D. 125.0 mL
Question 10
A 0.5 M solution of NaOH is to be diluted to 0.1 M solution by adding 200 mL of water. Calculate the initial volume of the NaOH solution.
A. 100 mL
B. 200 mL
C. 300 mL
D. 400 mL
Question 11
A sample of 1.00 g of an unknown hydrocarbon is burned in a combustion reaction. If 1.50 g of carbon dioxide is produced, what is the empirical formula of the hydrocarbon?
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Question 12
A metal, M, has an atomic mass of 55.8 g/mol. If 2.5 g of the metal is dissolved in 100 mL of water, what is the concentration of the solution in terms of molarity?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 13
A 2.5 M solution of H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.5
B. 2.5
C. 3.5
D. 4.5
Question 14
A 2.5 L sample of a gas at 27°C and 1.5 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas.
A. 2.5 atm
B. 3.5 atm
C. 4.5 atm
D. 5.5 atm
Question 15
A mixture of 2.00 g of an unknown gas and 3.00 g of oxygen is heated to 100°C at 1.00 atm. If the total pressure is 2.00 atm, what is the partial pressure of the unknown gas?
A. 0.50 atm
B. 1.00 atm
C. 1.50 atm
D. 2.00 atm

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: