POST UTME VERITAS UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 pKa of the base.
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 2
A solution of a weak base B is 20% dissociated. If the concentration of the solution is 0.1 M, calculate the pOH of the solution.
A. 1.0
B. 1.5
C. 2.0
D. 2.5
Question 3
A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the number of moles of gas.
A. 0.2 mol
B. 0.5 mol
C. 1 mol
D. 2 mol
Question 4
A gas at 300 K and 1 atm expands to fill a volume of 2 L. What is the new pressure of the gas?
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 5
A sample of a polymer, P, has a molecular weight of 100,000 g/mol. If 1.0 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1.0 g/L
C. 10.0 g/L
D. 100.0 g/L
Question 6
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. -74.8 kJ/mol
C. -74.8 kJ/mol
D. -74.8 kJ/mol
Question 7
A 2.0 M solution of CH3COOH is titrated with a 1.0 M solution of NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
Question 8
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 9
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?
A. 1
B. 2
C. 3
D. 4
Question 10
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the initial volume of HCl in liters?
A. 0.1 L
B. 0.01 L
C. 0.001 L
D. 0.0001 L
Question 11
A metal M has a s\tandard electrode potential of +0.5 V. What is the potential of the cell when a solution of M2+ ions is in contact with a solution of M3+ ions?
A. -0.5 V
B. 0.0 V
C. +0.5 V
D. +1.0 V
Question 12
A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the pressure of the gas.
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 13
A 1.00 g sample of a metal is heated in a stream of oxygen gas to produce a 2.00 g sample of the oxide. What is the molar mass of the metal?
A. 16
B. 32
C. 64
D. 128
Question 14
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 15
A solution containing 0.10 M NaOH is titrated with 0.10 M HCl. At the equivalence point, the pH of the solution is 7.00. What is the initial pH of the NaOH solution?
A. 0.00
B. 1.00
C. 2.00
D. 3.00

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