POST UTME ABU 2018 Chemistry | Objective

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Question 1
A solution of HCl is titrated with a solution of NaOH. The initial pH of the solution is 2. If 25 mL of 1 M NaOH is added to 50 mL of 0.5 M HCl, what is the pH of the solution after the addition of the NaOH?
A. 3
B. 4
C. 5
D. 6
Question 2
A polymer is formed by the condensation reaction between a diol and a diacid. The molecular weight of the polymer is 50,000 g/mol. If the molecular weight of the diol is 180 g/mol and that of the diacid is 120 g/mol, what is the average molecular weight of the repeating unit of the polymer?
A. 150
B. 180
C. 200
D. 220
Question 3
A cell contains 0.1 M glu\cose and 0.1 M oxygen. If the cell is 100 mL in volume, what is the concentration of glu\cose and oxygen in the cell?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
A 100.0 mL sample of a solution containing 0.100 M H2SO4 is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 50.0 mL of NaOH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 5
Determine the number of moles of CO2 produced from the complete combustion of 2.5 g of C6H14.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 6
A 100 mL sample of a solution containing 0.5 M HCl is mixed with 100 mL of a solution containing 0.5 M NaOH. What is the concentration of the resulting solution?
A. 0.5 M
B. 1 M
C. 1.5 M
D. 2 M
Question 7
A 1.0 L flask contains 0.5 mol of O2 at 25°C. Calculate the number of moles of CO produced.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1.0 mol
Question 8
The diagram below shows a titration setup. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the concentration of the resulting solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 9
A 1.00 L sample of a solution containing 0.100 M HCl and 0.100 M NaOH is titrated with 0.100 M H2SO4. What is the pH of the solution after the titration?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A mixture of 2 g of NaCl and 3 g of KCl is dissolved in 100 mL of water. If the density of the solution is 1.2 g/mL, what is the molality of the solution?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 11
A 1.00 L sample of a solution containing 0.100 M HCl and 0.100 M NaOH is titrated with 0.100 M H2SO4. What is the concentration of H+ ions in the solution after the titration?
A. 0.100 M
B. 0.100 M
C. 0.500 M
D. 0.500 M
Question 12
The rate cons\tant of 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. 0.005 M
B. 0.05 M
C. 0.1 M
D. 1 M
Question 13
A 25.0 mL sample of 0.100 M HCl is mixed with a 25.0 mL sample of 0.100 M NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
A 2.00 g sample of a polymer is dissolved in 100.0 mL of a solvent. The solution has a vis\cosity of 0.500 Pa·s. What is the molar mass of the polymer?
A. 100.0 g/mol
B. 100.0 g/mol
C. 500.0 g/mol
D. 500.0 g/mol
Question 15
A sample of gas occupies 2.5 L at 27°C and 1 atm. What is the volume of the gas at 37°C and 2 atm?
A. 1.25 L
B. 2.5 L
C. 5 L
D. 10 L

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