POST UTME UNIBEN 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of 1.0 g of a non-metallic element is analyzed by combustion. The amount of O2 consumed is 0.8 g, and the amount of CO2 produced is 0.2 g. What is the empirical formula of the element?
A. O2
B. S8
C. Cl2
D. F2
Question 2
The diagram below shows a circuit. What is the purpose of the resistor?
A. To reduce the voltage
B. To reduce the current
C. To increase the voltage
D. To increase the current
Question 3
In the reaction 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s), what is the oxidation state of aluminum (Al) in the product Al2O3?
A. 0
B. +3
C. +1
D. -3
Question 4
A 2.5 M solution of HCl is mixed with a 1.5 M solution of NaOH. What is the concentration of the resulting solution?
A. 2.0 M
B. 1.5 M
C. 3.0 M
D. 4.0 M
Question 5
A polymer is composed of 80% polyethylene and 20% polypropylene. If 100g of the polymer is heated to 200°C, calculate the amount of polyethylene that will melt.
A. 40g
B. 50g
C. 60g
D. 80g
Question 6
A 2.50 L flask contains a mixture of 1.50 mol of CO2 and 2.00 mol of O2 at 25°C. Calculate the partial pressure of CO2.
A. 0.500 atm
B. 0.750 atm
C. 1.000 atm
D. 1.250 atm
Question 7
A metal alloy is composed of 70% copper and 30% zinc. If 250g of the alloy is heated to 1000°C, calculate the amount of copper that will melt.
A. 120g
B. 150g
C. 180g
D. 200g
Question 8
A solution of NaCl is prepared by dissolving 35 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 9
A mixture of 2.5 g of glu\cose and 1.5 g of fructose is dissolved in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.1 g/L
C. 0.15 g/L
D. 0.2 g/L
Question 10
A solution of 0.1 M NaCl is mixed with a solution of 0.1 M NaOH. What is the concentration of the resulting solution?
A. 0.1 M
B. 0.05 M
C. 0.2 M
D. 0.15 M
Question 11
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 g of water at 25°C. Calculate the molality of the solution.
A. 0.25 mol/kg
B. 0.50 mol/kg
C. 0.75 mol/kg
D. 1.00 mol/kg
Question 12
The following diagram shows a circuit setup. Identify the part labeled A.
A. A resistor
B. A battery
C. A capacitor
D. An inductor
Question 13
A sample of 2.0 g of an organic compound containing only carbon and hydrogen is analyzed by combustion. The amount of CO2 produced is 1.2 g, and the amount of H2O produced is 0.8 g. What is the empirical formula of the compound?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 14
The following diagram shows a titration setup. Identify the part labeled A.
A. A burette
B. A beaker
C. A pipette
D. A flask
Question 15
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the concentration of the solution
C. To mix the solutions
D. To filter the solution

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