POST UTME WELLSPRING UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.100 M NaOH(aq) is titrated with 0.100 M HCl(aq). What is the pH of the solution after 50.0 mL of HCl(aq) has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 2
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 3
Calculate the molarity of a solution containing 2.5 g of NaCl in 250 mL of water.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
A diagram of a periodic table is shown below. Identify the element with atomic number 20.
A. Ca
B. Mg
C. Na
D. K
Question 5
The s\tandard electrode potential of the cell is given by E^\circ = E^\circ_{cathode} - E^\circ_{anode}. If the s\tandard electrode potential of the cathode is 0.5 V and the s\tandard electrode potential of the anode is -0.2 V, what is the s\tandard electrode potential of the cell?
A. 0.7 V
B. 0.7 V
C. 0.7 V
D. 0.7 V
Question 6
The s\tandard enthalpy of formation of CO_(2) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H_(2)O?
A. -241.8 kJ/mol
B. -241.8 kJ/mol
C. -241.8 kJ/mol
D. -241.8 kJ/mol
Question 7
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 8
A 0.1 M solution of a weak acid HA is mixed with 0.1 M solution of a strong base NaOH. If the initial concentration of HA is 0.1 M, what is the concentration of HA after the reaction is complete?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 9
A polymer has a molecular weight of 100,000 g/mol. What is the number of monomer units in the polymer?
A. 100
B. 1000
C. 10,000
D. 100,000
Question 10
A sample of air contains 20% oxygen, 70% nitrogen, and 10% other gases. If 100 L of this air is collected at 25°C and 1 atm, what is the volume of oxygen in the sample?
A. 20 L
B. 22 L
C. 24 L
D. 26 L
Question 11
The s\tandard electrode potential of the cell is given by E^\circ = E^\circ_{cathode} - E^\circ_{anode}. If the s\tandard electrode potential of the cathode is 0.5 V and the s\tandard electrode potential of the anode is -0.2 V, what is the s\tandard electrode potential of the cell?
A. 0.7 V
B. 0.7 V
C. 0.7 V
D. 0.7 V
Question 12
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s).
A. -1000 kJ/mol
B. -2000 kJ/mol
C. -3000 kJ/mol
D. -4000 kJ/mol
Question 13
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C6H12O6(s) to form CO2(g) and H2O(l).
A. -2803.5 kJ/mol
B. -2803.5 kJ/mol
C. -2803.5 kJ/mol
D. -2803.5 kJ/mol
Question 14
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 15
A 1.0 L sample of a gas at 25°C and 1 atm is heated to 50°C at cons\tant volume. What is the new pressure of the gas?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm

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