POST UTME BELLS UNIVERSITY 2024 Chemistry | Objective

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Question 1
The rate cons\tant (k) of a first-order reaction is 0.05 min^-1. Calculate the half-life of the reaction.
A. 10
B. 20
C. 30
D. 40
Question 2
A 2.50 g sample of a polymer is dissolved in 25.0 mL of a solvent. If the density of the solution is 1.05 g/mL, calculate the molar mass of the polymer.
A. 500 g/mol
B. 1000 g/mol
C. 2000 g/mol
D. 5000 g/mol
Question 3
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase?
A. To separate the components of a mixture
B. To identify the components of a mixture
C. To measure the concentration of a solution
D. To measure the pH of a solution
Question 4
The rate of a chemical reaction is influenced by several factors, including the concentration of the reac\tants. Which of the following factors would increase the rate of a reaction?
A. Increa\sing the temperature
B. Decrea\sing the concentration of the reac\tants
C. Increa\sing the surface area of the reac\tants
D. U\sing a catalyst
Question 5
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. Calculate the s\tandard enthalpy of formation of N2(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 6
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 7
The element with atomic number 12 is classified as a metalloid. Which of the following elements has the same group number as this element?
A. Mg
B. Si
C. Al
D. P
Question 8
The diagram below shows a titration setup. Identify the part labeled A.
A. A
B. B
C. C
D. D
Question 9
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.025
B. 0.05
C. 0.1
D. 0.2
Question 10
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 11
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the pH of the solution
C. To measure the temperature of the solution
D. To measure the density of the solution
Question 12
A 0.500 M solution of HCl is prepared by dissolving 25.0 g of HCl in 1.00 L of water. What is the concentration of H+ ions in the solution?
A. 0.500 M
B. 0.250 M
C. 0.100 M
D. 0.0500 M
Question 13
The pH of a solution is a measure of its acidity or basicity. Which of the following solutions has a pH of 7?
A. 0.1 M HCl
B. 0.1 M NaOH
C. 0.1 M H2SO4
D. 0.1 M NaCl
Question 14
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 15
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C(s) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol

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