POST UTME COVENANT UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Test tube
D. Cylinder
Question 2
A 2.50 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 3
A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. If 50 mL of the NaOH solution is added to 100 mL of the HCl solution, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 4
A 2.50 M solution of NaOH is titrated with a 1.00 M solution of HCl. What is the pH of the solution after 25.0 mL of HCl has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 5
The s\tandard enthalpy of combustion \( ΔH^circ_c \) for C(s) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion for CO2(g) u\sing Hess's law.
A. -393.5 kJ/mol
B. -394.5 kJ/mol
C. -395.5 kJ/mol
D. -396.5 kJ/mol
Question 6
A 0.1 M solution of a weak base B is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of the base.
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of CH4(g)?
A. -74.8 kJ/mol
B. -74.5 kJ/mol
C. -74.2 kJ/mol
D. -75.1 kJ/mol
Question 8
Determine the number of moles of electrons transferred in the reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s).
A. 2
B. 4
C. 6
D. 8
Question 9
A sample of nitrogen gas occupies a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 298 K. What is the volume of the gas at a pressure of 2.00 atm and a temperature of 298 K?
A. 1.25 L
B. 2.50 L
C. 3.75 L
D. 5.00 L
Question 10
A polymer is formed by the condensation reaction between two monomers, A and B. If the molecular weight of the polymer is 200 g/mol and the molecular weights of the monomers are 50 g/mol and 100 g/mol, respectively, what is the ratio of the number of moles of monomer A to the number of moles of monomer B in the polymer?
A. 1:2
B. 2:1
C. 1:1
D. 3:2
Question 11
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of the acid.
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M
Question 12
A 2.5 M solution of sodium hydroxide is mixed with a 1.5 M solution of hydrochloric acid. If 50 mL of the sodium hydroxide solution is added to 100 mL of the hydrochloric acid solution, calculate the pH of the resulting solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 13
Determine the oxidation state of the sulfur atom in the compound H2SO4.
A. +2
B. +4
C. +6
D. +8
Question 14
A solution containing 0.1M NaCl is mixed with a solution containing 0.1M AgNO3. The resulting precipitate is filtered and dried. Calculate the mass of the precipitate.
A. 0.01g
B. 0.02g
C. 0.03g
D. 0.04g
Question 15
A 1.00 M solution of H2SO4 is titrated with a 1.00 M solution of 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

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