POST UTME UNILORIN 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the resulting solution?
A. ( 7 )
B. ( 7.3 )
C. ( 7.5 )
D. ( 7.7 )
Question 2
A 2.5 L flask contains 0.15 mol of an ideal gas at 27°C. Calculate the pressure of the gas.
A. \( 1.01 \times 10^5 , \text{Pa} \)
B. \( 2.03 \times 10^5 , \text{Pa} \)
C. \( 3.05 \times 10^5 , \text{Pa} \)
D. \( 4.07 \times 10^5 , \text{Pa} \)
Question 3
A 0.1 M solution of a monoprotic acid has a pH of 2. Determine the concentration of the acid if the pH is increased to 3 by the addition of 25 mL of 0.1 M NaOH.
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 4
Determine the rate cons\tant for the first-order reaction: ln[A] = -kt + ln[A]0
A. ( 2.303 )
B. \( 2.303 ln left\( \frac{[A]_0}{[A]} \right \ \) )
C. \( \frac{2.303}{t} \)
D. \( \frac{2.303}{t} ln left\( \frac{[A]_0}{[A]} \right \ \) )
Question 5
A solution of sodium carbonate, Na2CO3, has a concentration of 0.200 M. Calculate the pH of the solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the resulting pH of the solution?
A. 7.0
B. 10.0
C. 12.0
D. 14.0
Question 7
The polymerization of styrene to polystyrene involves the addition of a monomer unit to the growing polymer chain. What is the type of polymerization reaction that occurs in this process?
A. Condensation polymerization
B. Addition polymerization
C. Ring-opening polymerization
D. Step-growth polymerization
Question 8
Determine the number of moles of oxygen gas (O2) that react with 2.5 moles of carbon monoxide (CO) in the following equation: 2CO + O2 → 2CO2.
A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles
Question 9
A 10% solution of NaOH is prepared by dissolving 10 g of NaOH in 90 g of water. What is the molarity of the solution?
A. \( 0.1 , \text{M} \)
B. \( 0.2 , \text{M} \)
C. \( 0.3 , \text{M} \)
D. \( 0.4 , \text{M} \)
Question 10
A sample of a metal oxide is heated in a crucible. The oxide decomposes into a metal and oxygen gas. What is the type of reaction that occurs in this process?
A. Decomposition reaction
B. Combustion reaction
C. Neutralization reaction
D. Oxidation reaction
Question 11
A solution of hydrochloric acid, HCl, has a concentration of 0.500 M. Calculate the molarity of the solution after 25.0 mL of the solution has been diluted to a total volume of 100.0 mL.
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 12
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Pipette
Question 13
A sample of a metal has a mass of 25 g and a volume of 2.5 cm³. What is the density of the metal in g/cm³?
A. 5 g/cm³
B. 10 g/cm³
C. 15 g/cm³
D. 20 g/cm³
Question 14
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 25 mL of 0.1 M NaOH is added to 100 mL of the solution?
A. 1
B. 2
C. 3
D. 4
Question 15
A sample of a gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of the gas?
A. 1 atm
B. 0.95 atm
C. 1.05 atm
D. 0.90 atm

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