POST UTME OAU 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Which of the following elements is a noble gas?
A. O
B. Ne
C. S
D. Cl
Question 2
A 0.1 M solution of NaOH is prepared by dissolving 2 g of NaOH in 100 mL of water. Calculate the number of moles of NaOH used in preparing the solution.
A. 0.01 mol
B. 0.02 mol
C. 0.03 mol
D. 0.04 mol
Question 3
The s\tandard enthalpy of formation of O2(g) is 0 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of O2(g) to form 2 moles of CO2(g).
A. -393.5 kJ/mol
B. -787.0 kJ/mol
C. 0 kJ/mol
D. 1.5 kJ/mol
Question 4
A polymer is prepared by the condensation reaction of a diol with a diacid. The molecular weight of the polymer is 50,000 g/mol. If the molecular weight of the repeating unit is 200 g/mol, what is the degree of polymerization?
A. 200
B. 250
C. 300
D. 350
Question 5
A 1 L solution of 0.1 M HCl is prepared by dissolving 3.5 g of HCl in water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 6
A 2.0 M solution of HCl is prepared by dissolving 4.0 g of HCl in 1 L of water. What is the molarity of the solution?
A. 2.0 M
B. 4.0 M
C. 6.0 M
D. 8.0 M
Question 7
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in water to make 1 L of solution. What is the pH of the solution?
A. 13
B. 12
C. 11
D. 10
Question 8
A 1 L solution of 0.1 M NaOH is prepared by dissolving 4 g of NaOH in water. What is the concentration of the solution in terms of molarity?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 9
A sample of nitrogen gas is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 0.0313 atm, what is the mole \fraction of nitrogen gas?
A. 0.99
B. 0.995
C. 0.998
D. 0.999
Question 10
A 1.5 M solution of NaOH is prepared by dissolving 3.0 g of NaOH in 1 L of water. What is the molarity of the solution?
A. 1.5 M
B. 3.0 M
C. 4.5 M
D. 6.0 M
Question 11
A 2 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 12
A 3.0 M solution of HCl is prepared by dissolving 6.0 g of HCl in 1 L of water. What is the molarity of the solution?
A. 3.0 M
B. 6.0 M
C. 9.0 M
D. 12.0 M
Question 13
What is the major product of the reaction between 2-methylpropane and HCl?
A. 2-chloro-2-methylpropane
B. 2-methyl-2-chloropropane
C. 2-chloro-1-methylpropane
D. 2-methyl-1-chloropropane
Question 14
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C(s) to form CO(g).
A. 110.5 kJ/mol
B. -110.5 kJ/mol
C. 0 kJ/mol
D. -1.5 kJ/mol
Question 15
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of water at 25°C and 1 atm, given that the cell potential is 1.23 V and the current is 0.5 A.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol

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