POST UTME KSU 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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
Question 3
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 4
A 25 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 5
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 6
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 7
A 2.0 g sample of a non-metallic oxide is analyzed by acid-base titration. The titration curve shows a pH of 7 at the equivalence point. What is the molar mass of the oxide?
A. 50 g/mol
B. 100 g/mol
C. 150 g/mol
D. 200 g/mol
Question 8
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 9
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 10
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 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 zinc that will be oxidized?
A. 125g
B. 150g
C. 175g
D. 200g
Question 12
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 13
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 14
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 15
A 2.0 g sample of an unknown hydrocarbon is burned in a combustion calorimeter, producing 3.2 g of CO2 and 1.8 g of H2O. Calculate the empirical formula of the hydrocarbon.
A. C2H4
B. C3H6
C. C4H8
D. C5H10

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