POST UTME MADONNA UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.150 M NaCl. Calculate the concentration of Cl- ions in the solution.
A. 0.075 M
B. 0.0750 M
C. 0.0755 M
D. 0.076 M
Question 2
A 1.00 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the s\tandard enthalpy of formation of the gas.
A. -393.5 kJ/mol
B. -110.5 kJ/mol
C. -283.0 kJ/mol
D. -197.7 kJ/mol
Question 3
A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 0.5 L at the same temperature. What is the new pressure of the gas?
A. 2
B. 3
C. 4
D. 5
Question 4
The half-life of a radioactive subs\tance is 5.0 days. If 100 g of the subs\tance is initially present, how much will remain after 20 days?
A. 12.5 g
B. 25.0 g
C. 50.0 g
D. 100 g
Question 5
A solution of sodium chloride is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 6
A 2.00 M solution of HCl is mixed with a 2.00 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 7
A 2.0 M solution of NaOH is prepared by dissolving 2 mol of NaOH in 1 L of water. What is the concentration of NaOH in the solution after 10 mL of the solution is diluted to 100 mL with water?
A. 0.2 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 8
A 2.0 M solution of HCl is prepared by dissolving 40.0 g of HCl in 1.0 L of water. What is the mass of HCl required to prepare 1.0 L of 1.0 M solution?
A. 20.0 g
B. 40.0 g
C. 60.0 g
D. 80.0 g
Question 9
The s\tandard enthalpy of combustion of methane is -890.3 kJ/mol. Calculate the s\tandard enthalpy of formation of methane at 298 K.
A. -50.5 kJ/mol
B. -74.8 kJ/mol
C. -890.3 kJ/mol
D. -110.5 kJ/mol
Question 10
What is the molar mass of a compound composed of 50% carbon and 50% oxygen by mass?
A. 12 g/mol
B. 24 g/mol
C. 36 g/mol
D. 48 g/mol
Question 11
A 2.0 g sample of a metal is heated in a crucible until it melts. The resulting liquid is then cooled and solidified. What is the type of crystal structure that the metal will exhibit?
A. Face-Centered Cubic
B. Body-Centered Cubic
C. Hexagonal Close-Packed
D. Diamond Cubic
Question 12
A 3.0 M solution of NaCl is prepared by dissolving 3 mol of NaCl in 1 L of water. What is the concentration of NaCl in the solution after 10 mL of the solution is diluted to 100 mL with water?
A. 0.3 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 13
A 1.00 M solution of K2Cr2O7 is mixed with a 1.00 M solution of FeSO4. What is the concentration of Cr3+ ions in the resulting solution?
A. 0.500 M
B. 0.667 M
C. 0.750 M
D. 1.00 M
Question 14
A 2.5 M solution of NaCl is prepared by dissolving 25 g of NaCl in 1000 mL of water. What is the molarity of the solution after 10 mL of the solution is diluted to 100 mL with water?
A. 0.25 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 15
A 0.5 M solution of AgNO3 is prepared by dissolving 25.0 g of AgNO3 in 1.0 L of water. What is the molarity of the solution if 25.0 g of AgNO3 is used to prepare 2.0 L of solution?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 0.25 M

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