POST UTME CALEB UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50-g sample of a non-metallic oxide is found to contain 0.750 g of oxygen. What is the empirical formula of the oxide?
A. MgO
B. SiO2
C. CO2
D. SO3
Question 2
A 1.0 M solution of $H_2SO_4$ is mixed with a 1.0 M solution of $NaOH$. If the reaction is allowed to go to completion, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 3
A 1.0 M solution of $H_2SO_4$ is mixed with a 1.0 M solution of $NaOH$. If the reaction is allowed to go to completion, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 4
A 2.00 L flask contains 0.150 mol of an ideal gas at 27°C. Calculate the volume of the flask in liters.
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 5
The pH of a 0.100 M solution of HCl is 1.00. What is the concentration of H+ ions in the solution?
A. 0.100 M
B. 0.100 M
C. 0.100 M
D. 0.100 M
Question 6
A 100.0 mL sample of a solution containing 0.0500 M NaOH is titrated with 0.100 M HCl. If 50.0 mL of HCl is required to reach the equivalence point, what is the volume of the NaOH solution?
A. 50.0 mL
B. 100.0 mL
C. 150.0 mL
D. 200.0 mL
Question 7
A 1.0 M solution of $HCl$ is mixed with a 1.0 M solution of $NaOH$. If the reaction is allowed to go to completion, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 8
A 100.0 mL sample of a solution containing 0.0500 M NaOH is titrated with 0.100 M HCl. If 50.0 mL of HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 9
A diagram of a simple distillation setup is shown below. If the vapor pressure of the solvent at 25°C is 760 mmHg, what is the boiling point of the solution?
A. 80.0°C
B. 90.0°C
C. 100.0°C
D. 110.0°C
Question 10
A 0.500 M solution of HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 11
Determine the pH of a solution containing 0.1 M NaOH and 0.1 M HCl.
A. 7
B. 10
C. 14
D. 12
Question 12
A 2.0 L sample of a gas at 25°C and 1.0 atm is compressed to 2.5 atm at cons\tant temperature. Calculate the new volume of the gas.
A. 1.6
B. 1.8
C. 2.0
D. 2.2
Question 13
A 2.50 g sample of a metal (M) is dissolved in 50.0 mL of 0.100 M HCl. The resulting solution is then titrated with 0.0500 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the identity of the metal?
A. Zn
B. Fe
C. Cu
D. Ag
Question 14
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, ΔHf(C(s)) = 0 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.19 kJ/mol
C. -1206.11 kJ/mol
D. -1206.31 kJ/mol
Question 15
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 25.0 mL of 0.100 M CuSO4(aq) is reacted with 5.00 g of zinc metal, calculate the number of moles of copper metal produced.
A. 0.0015 mol
B. 0.0025 mol
C. 0.0035 mol
D. 0.0045 mol

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