POST UTME CHRISTOPHER UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 M solution of H₂SO₄ is titrated with 1.00 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 2
A 2.0 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. What is the final volume of the gas, assuming ideal behavior?
A. 0.5 L
B. 1.0 L
C. 1.5 L
D. 2.0 L
Question 3
A 0.1 M solution of a weak base, B, is prepared by dissolving 0.1 g of B in 100 mL of water. If the density of the solution is 1.0 g/mL, what is the pOH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 4
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 5
A 1.0 M solution of NaOH is titrated with a solution of 0.5 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH in liters?
A. 0.1 L
B. 0.2 L
C. 0.4 L
D. 0.8 L
Question 6
A 100 mL sample of a solution containing 0.050 M NaOH is titrated with 0.050 M HCl. Calculate the pH of the solution after the titration.
A. 7.0
B. 7.0
C. 7.0
D. 7.0
Question 7
A mixture of 50 mL of ethanol (C2H5OH) and 50 mL of water is titrated with a solution of sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 8
A 2.0 L flask contains 0.050 M H2(g) and 0.050 M I2(g). If the reaction is: H2(g) + I2(g) → 2HI(g), calculate the equilibrium cons\tant (Kc) at 298 K.
A. 1.0
B. 1.0
C. 1.0
D. 1.0
Question 9
Determine the molar mass of a polymer with the following repeating unit: CH2CH2OCH2CH2OCH3. Assume that the polymer has a degree of polymerization of 100.
A. 200 g/mol
B. 300 g/mol
C. 400 g/mol
D. 500 g/mol
Question 10
A 1.00 M solution of H₂SO₄ is titrated with 1.00 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 11
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 12
The diagram below shows a circuit setup. If a 9.0 V battery is connected to a 10.0 Ω resistor, what is the current flowing through the resistor?
A. 0.9 A
B. 1.0 A
C. 1.1 A
D. 1.2 A
Question 13
A solution contains 0.050 M NH3 and 0.050 M NH4Cl. Calculate the concentration of OH- ions in the solution.
A. 0.025 M
B. 0.050 M
C. 0.050 M
D. 0.100 M
Question 14
Determine the number of moles of ΔH₂O(g) produced when 2.50 g of H₂(g) reacts with O₂(g) according to the equation: 2H₂(g) + O₂(g) → 2ΔH₂O(g).
A. 0.0500 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 15
A 2.0 g sample of a polymer, P, is dissolved in 100 mL of a solvent. If the concentration of the solution is 0.1 g/mL, what is the molar mass of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol

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