POST UTME IMS U 2020 Chemistry | Objective

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Question 1
A 25.0 mL sample of a solution containing 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.00250 mol
B. 0.00275 mol
C. 0.00300 mol
D. 0.00325 mol
Question 2
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. Determine the pH of the resulting solution after the reaction is complete.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 3
The diagram below shows the structure of a ha\logen. What is the type of bond that exists between the central atom and the outer atoms?
A. Covalent bond
B. Ionic bond
C. Polar covalent bond
D. Hydrogen bond
Question 4
A 1.0 M solution of a salt, NaOH, is mixed with 1.0 M HCl. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 5
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 298 K. The gas is heated to a temperature of 373 K. Calculate the new volume of the gas, assuming that the amount of gas remains cons\tant.
A. 3.5 L
B. 4.5 L
C. 5.5 L
D. 6.5 L
Question 6
Determine the molar solubility of Ag2CrO4 in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for Ag2CrO4 is 1.1 × 10^-12.
A. 1.0 × 10^-5 M
B. 1.5 × 10^-5 M
C. 2.0 × 10^-5 M
D. 3.0 × 10^-5 M
Question 7
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in water to make 1 L of solution. What is the molarity of the solution?
A. 2.0 M
B. 2.5 M
C. 3.0 M
D. 3.5 M
Question 8
The rate cons\tant for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 min?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 9
A 50.0 mL sample of a solution containing 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the pH of the solution at the equivalence point.
A. 7.00
B. 7.50
C. 8.00
D. 8.50
Question 10
A 0.1 M solution of a weak base, B, is titrated with 0.1 M HCl. If the initial pH of the solution is 9.5, what is the pH after the addition of 20 mL of 0.1 M HCl?
A. 7.5
B. 8.5
C. 9.5
D. 10.5
Question 11
A 0.1 M solution of a weak acid, HA, is titrated with 0.1 M NaOH. If the initial pH of the solution is 3.5, what is the pH after the addition of 20 mL of 0.1 M NaOH?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 12
A 2.50 L flask contains 0.250 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 1.02 × 10^5 Pa
C. 1.03 × 10^5 Pa
D. 1.04 × 10^5 Pa
Question 13
A sample of a gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 298 K. What is the volume of the gas at a pressure of 3.0 atm and a temperature of 323 K?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 14
A 0.1 M solution of hydrochloric acid (HCl) is prepared by dissolving 3.0 g of HCl in water to make 1 L of solution. What is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 15
The diagram below shows the structure of a polymer chain. What is the type of polymerization reaction that occurred to form this chain?
A. Addition polymerization
B. Condensation polymerization
C. Ring-opening polymerization
D. Step-growth polymerization

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