POST UTME ABU 2018 Chemistry | Objective

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Question 1
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 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
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. NaOH
B. HCl
C. CH3COOH
D. NH3
Question 4
A polymer is formed by the condensation reaction between two monomers, A and B. The molecular weight of the polymer is 500 g/mol. If the molecular weights of monomers A and B are 150 g/mol and 200 g/mol, respectively, what is the average molecular weight of the monomers that reacted to form the polymer?
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 5
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 6
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 7
A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. If the molarity of the solution is 0.5 M, what is the molar mass of the subs\tance?
A. 10 g/mol
B. 20 g/mol
C. 40 g/mol
D. 80 g/mol
Question 8
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 9
A solution contains 2.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 10
A solution of 0.100 M NaCl is mixed with a solution of 0.100 M AgNO3. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.0500 M
C. 0.200 M
D. 0.050 M
Question 11
A solution contains 0.1 M NaOH and 0.2 M HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 12
A first-order reaction has a rate cons\tant of 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. 0.15 M
D. 0.2 M
Question 13
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 14
A 10.0 g sample of a polymer is dissolved in 100.0 mL of solvent. What is the molar mass of the polymer if the osmotic pressure is 2.50 atm at 25°C?
A. 1000 g/mol
B. 2000 g/mol
C. 3000 g/mol
D. 4000 g/mol
Question 15
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 pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4

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