POST UTME KSU 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a metal (X) has a density of 8.5 g/cm3 and a volume of 2.5 cm3. If the metal is 85% pure, calculate the mass of the impurities present.
A. 0.25 g
B. 0.5 g
C. 1.0 g
D. 1.5 g
Question 2
A 2.50 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, calculate the number of moles of HCl present in 100.0 mL of the HCl solution.
A. 0.0250 mol
B. 0.0500 mol
C. 0.100 mol
D. 0.200 mol
Question 3
A diagram of a titration setup is shown below.
A. The burette contains NaOH.
B. The beaker contains HCl.
C. The burette contains HCl.
D. The beaker contains NaOH.
Question 4
A sample of a gas has a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 25.0°C. If the pressure is increased to 2.00 atm and the temperature is increased to 50.0°C, calculate the new volume of the gas.
A. 3.13 L
B. 4.00 L
C. 5.00 L
D. 6.25 L
Question 5
A solution of H2SO4 is 80% by mass. If 250 mL of the solution has a mass of 220 g, calculate the molarity of the solution.
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 6
A solution of 0.1M NaOH is mixed with a solution of 0.1M HCl. What is the concentration of the resulting solution?
A. 0.05M
B. 0.1M
C. 0.15M
D. 0.2M
Question 7
A sample of a metal, M, has a mass of 25.0 g and a volume of 2.50 cm3. If the density of the metal is 5.50 g/cm3, calculate the molar mass of M.
A. 0.250 kg/mol
B. 0.500 kg/mol
C. 1.00 kg/mol
D. 2.00 kg/mol
Question 8
A sample of water contains 10ppm of dissolved oxygen. What is the concentration of oxygen in mg/L?
A. 10mg/L
B. 20mg/L
C. 30mg/L
D. 40mg/L
Question 9
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C.
A. 1
B. 2
C. 3
D. 4
Question 10
A sample of a metal oxide, M2O3, has a mass of 25.0 g and a volume of 2.50 cm3. If the density of the metal oxide is 5.50 g/cm3, calculate the molar mass of M2O3.
A. 0.250 kg/mol
B. 0.500 kg/mol
C. 1.00 kg/mol
D. 2.00 kg/mol
Question 11
A metal alloy is composed of 75% copper and 25% zinc. If 500g of the alloy is heated to 1000°C, what is the mass of copper that will be oxidized?
A. 125g
B. 150g
C. 175g
D. 200g
Question 12
A metal alloy is composed of 75% copper and 25% zinc. If 500g of the alloy is heated to 1000°C, what is the mass of zinc that will be oxidized?
A. 125g
B. 150g
C. 175g
D. 200g
Question 13
A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: 2X + Cl2 → 2XCl. If 2.5 g of X reacts with 1.8 g of Cl2, calculate the molar mass of X.
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 14
A solution of 0.1M NaOH is mixed with a solution of 0.1M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 15
A 2.00 M solution of NaOH is titrated with a 1.00 M solution of HCl. If 25.0 mL of HCl is required to reach the equivalence point, calculate the pH of the resulting solution.
A. 0.000
B. 1.000
C. 2.000
D. 3.000

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