POST UTME CHRISTOPHER UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of HCl is prepared by dissolving 25 g of HCl in water to make 1 L of solution. What is the molarity of the solution?
A. 2.5 M
B. 2.0 M
C. 1.5 M
D. 1.0 M
Question 2
A 25.0 mL sample of a 0.100 M solution of sodium hydroxide (NaOH) is titrated with a 0.100 M solution of hydrochloric acid (HCl). Determine the pH of the resulting solution after the titration is complete.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 3
A solution of HCl is 0.5 M. If 25 mL of this solution is titrated with 0.5 M NaOH, what is the pH of the resulting solution?
A. \( pH = 7 \)
B. \( pH = 9 \)
C. \( pH = 10 \)
D. \( pH = 11 \)
Question 4
The atomic radius of an element in Group 1 of the Periodic Table is 250 pm. If the element is in its +1 oxidation state, what is the radius of its ion?
A. 250 pm
B. 200 pm
C. 150 pm
D. 100 pm
Question 5
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the number of moles of acid present in 100 mL of the acid solution?
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 6
A 0.5 M solution of a weak acid, HX, is titrated with 0.5 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. \( pH = 7 \)
B. \( pH = 9 \)
C. \( pH = 10 \)
D. \( pH = 11 \)
Question 7
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 8
A 2.0 L flask contains 0.5 mol of a gas at a temperature of 298 K. If the gas is allowed to expand to a volume of 4.0 L at cons\tant temperature, what is the new pressure of the gas?
A. ( 0.125 atm )
B. ( 0.25 atm )
C. ( 0.5 atm )
D. ( 1.0 atm )
Question 9
A 10% solution of sulfuric acid is prepared by dissolving 10 g of sulfuric acid in 90 g of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 10
A 0.500 M solution of NaOH is titrated with 0.500 M HCl. If 25.0 mL of HCl is required to reach the equivalence point, what is the concentration of the acid in the original solution?
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 11
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If the gas is heated to 50°C at cons\tant volume, what is the new pressure?
A. 2.5 atm
B. 5 atm
C. 10 atm
D. 20 atm
Question 12
A sample of a non-metallic oxide, X2O3, has a mass of 25.0 g. If the molar mass of X2O3 is 224 g/mol, what is the number of moles of X2O3 present in the sample?
A. ( 0.11 mol )
B. ( 0.12 mol )
C. ( 0.13 mol )
D. ( 0.14 mol )
Question 13
A sample of a gas at 25°C and 1 atm is compressed to 4 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.25 L
B. 0.5 L
C. 1 L
D. 2 L
Question 14
A sample of a metal oxide, M2O3, has a molar mass of 228 g/mol. If 2.50 g of the oxide is dissolved in water to form a solution, what is the concentration of the metal ion, M, in the solution?
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 15
A mixture of 0.5 mol of an unknown gas and 0.2 mol of oxygen gas is placed in a 1 L container at 25°C. If the total pressure of the mixture is 1.5 atm, what is the partial pressure of the unknown gas?
A. 0.8 atm
B. 1.0 atm
C. 1.2 atm
D. 1.5 atm

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