POST UTME COVENANT UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 2
A solution contains 20 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 3
A solution contains 10 g of glu\cose in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.01 g/L
B. 0.1 g/L
C. 1 g/L
D. 10 g/L
Question 4
A 50 mL sample of a 0.1 M HCl solution is titrated with 0.1 M NaOH solution. What is the pH of the solution after the titration?
A. 1
B. 2
C. 3
D. 4
Question 5
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 6
A 2.00 M solution of HCl is mixed with 2.00 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 7
A 1.00 M solution of HCl is mixed with 1.00 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
A sample of nitrogen gas occupies a volume of 2 L at a pressure of 1 atm. What is the pressure of the gas if the volume is reduced to 1 L?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 9
A 2.0 L flask contains 0.5 mol of CO2 gas at 27°C. What is the partial pressure of CO2 in the flask?
A. 1.0 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 10
A 25.0 mL sample of 0.100 M HCl is mixed with 25.0 mL of 0.100 M NaOH. Calculate the pH of the resulting solution.
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 11
A 2.5 L flask contains 0.5 mol of an unknown gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.0 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 12
Determine the major product of the reaction between 2-methylpropene and HCl.
A. CH₃CH₂CH₂CH₂Cl
B. (CH₃)₂CHCH₂Cl
C. (CH₃)₃CCl
D. CH₃CH₂CH₂CH₂CH₂Cl
Question 13
A solution contains 0.500 M H₂SO₄ and 0.500 M NaOH. What is the pH of the solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
A polymer is formed by the condensation reaction between a diol and a diacid. If the molecular weight of the diol is 180 g/mol and the molecular weight of the diacid is 150 g/mol, what is the molecular weight of the polymer formed?
A. 450 g/mol
B. 600 g/mol
C. 900 g/mol
D. 1200 g/mol
Question 15
Determine the molar solubility of CaF2 in a 0.1 M NaF solution, given that the solubility product cons\tant (Ksp) for CaF2 is 3.9 x 10^-11.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M

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