POST UTME UNIPORT 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of HCl is titrated with 1.0 M NaOH. If 10 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?
A. 0.01 L
B. 0.1 L
C. 0.1 mL
D. 0.01 mL
Question 2
A mixture of 0.500 g of glu\cose (C6H12O6) and 0.250 g of fructose (C6H12O6) is dissolved in 50.0 mL of water. Calculate the molarity of the solution.
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 3
Determine the pH of a 0.1 M solution of HCl after 10 mL of 1 M NaOH has been added to 20 mL of the HCl solution. Assume the volume of the solution is cons\tant at 30 mL.
A. 1
B. 2
C. 3
D. 4
Question 4
A 2.5 g sample of an organic compound containing only carbon and hydrogen is analyzed by combustion. The volume of CO2 produced is 1.2 L at 25°C and 1 atm. The volume of H2O produced is 0.5 L at 25°C and 1 atm. Calculate the empirical formula of the compound.
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 5
A 2.5 M solution of sodium hydroxide (NaOH) is titrated with a 0.5 M solution of hydrochloric acid (HCl). If 25 mL of the HCl solution is required to reach the equivalence point, what is the volume of the NaOH solution that was initially added?
A. 12.5 mL
B. 25 mL
C. 50 mL
D. 100 mL
Question 6
A solution contains 2.5 g of sodium chloride per 100 mL of solution. What is the molarity of the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M
Question 7
A solution of 0.1 M H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 8
The half-life of a radioactive subs\tance is 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 9
Determine the number of moles of oxygen gas (O2) that react with 2.5 moles of carbon monoxide (CO) in the following reaction: 2CO + O2 → 2CO2. Assume that the reaction occurs at cons\tant pressure.
A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles
Question 10
In a redox reaction, what is the role of the oxidizing agent?
A. To gain electrons
B. To lose electrons
C. To facilitate the transfer of electrons
D. To prevent the reaction from occurring
Question 11
What is the expected product of the reaction between sulfuric acid and sodium hydroxide?
A. Sodium sulfate
B. Sulfuric acid
C. Sodium hydroxide
D. Water
Question 12
What is the primary difference between a saturated and an unsaturated hydrocarbon?
A. Saturated hydrocarbons have a \single bond between carbon atoms, while unsaturated hydrocarbons have multiple bonds
B. Saturated hydrocarbons have multiple bonds between carbon atoms, while unsaturated hydrocarbons have a \single bond
C. Saturated hydrocarbons are more stable than unsaturated hydrocarbons
D. Unsaturated hydrocarbons are more stable than saturated hydrocarbons
Question 13
A 2.00 g sample of a polymer is dissolved in 100.0 mL of a solvent. If the solution has a vis\cosity of 1.50 cP, calculate the number-average molecular weight (Mn) of the polymer.
A. 5000 g/mol
B. 10000 g/mol
C. 15000 g/mol
D. 20000 g/mol
Question 14
The half-life of a radioactive subs\tance is 5 years. If 100 grams of the subs\tance is initially present, what is the mass of the subs\tance remaining after 15 years?
A. 12.5 grams
B. 25 grams
C. 50 grams
D. 100 grams
Question 15
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the transfer of electrons
D. To inhibit the reaction

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