POST UTME UNIBEN 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25.0 mL of NaOH solution requires 32.5 mL of HCl solution to reach the \endpoint, calculate the concentration of the NaOH solution.
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 2
A 2.00-g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.75 g, calculate the percentage yield of the metal oxide.
A. 75%
B. 80%
C. 85%
D. 90%
Question 3
The reaction of a strong acid with a strong base is an example of a(n) _______________________ reaction.
A. neutralization
B. oxidation
C. reduction
D. combustion
Question 4
The reaction of a weak acid with a strong base is an example of a(n) _______________________ reaction.
A. neutralization
B. oxidation
C. reduction
D. combustion
Question 5
Determine the number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaC}_2$ is completely decomposed according to the equation $\text{CaC}_2(s) \rightarrow \text{Ca} (s) + \text{C} (s) + \text{CO}_2(g)$, given that the molar mass of $\text{CaC}_2$ is 64.10 g/mol.
A. 0.0391 mol
B. 0.0394 mol
C. 0.0397 mol
D. 0.0400 mol
Question 6
A 0.100 M solution of HCl is titrated with 0.500 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 7
A 2.50-g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.75 g, calculate the percentage yield of the metal oxide.
A. 75%
B. 80%
C. 85%
D. 90%
Question 8
The reaction of a strong acid with a strong base is an example of a(n) _______________________ reaction.
A. neutralization
B. oxidation
C. reduction
D. combustion
Question 9
A 2.50-g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.75 g, calculate the percentage yield of the metal oxide.
A. 75%
B. 80%
C. 85%
D. 90%
Question 10
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 11
The atomic radius of an atom is the dis\tance from the _______________________ to the outermost electron.
A. nucleus
B. proton
C. neutron
D. electron
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1206.0 kJ/mol
B. -1206.5 kJ/mol
C. -1207.0 kJ/mol
D. -1207.5 kJ/mol
Question 13
The reaction of an alkene with a strong acid is an example of a(n) _______________________ reaction.
A. substitution
B. elimination
C. addition
D. condensation
Question 14
A polymer is formed by the condensation reaction between a diol and a diacid. The molecular weight of the polymer is 500 g/mol. If 2.5 g of the polymer is dissolved in 25 mL of water, what is the concentration of the polymer solution in g/L?
A. 50 g/L
B. 100 g/L
C. 150 g/L
D. 200 g/L
Question 15
A colloidal solution of starch in water is 0.50 M. What is the concentration of the dispersed phase?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M

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