POST UTME SUMMIT UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between 1-bu\tanol and concentrated sulfuric acid is an example of a reaction that proceeds via the mechanism of electrophilic substitution. Which of the following is the correct product of this reaction?
A. 2-bu\tanol
B. 1-butene
C. 2-butene
D. bu\tane
Question 2
Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.
A. -1785.6 kJ/mol
B. -1785.9 kJ/mol
C. -1786.1 kJ/mol
D. -1786.3 kJ/mol
Question 3
A 0.1 M solution of H2SO4 is titrated with a 0.1 M solution of NaOH. If 50 mL of NaOH is required to reach the equivalence point, what is the volume of H2SO4 required to reach the equivalence point?
A. 50 mL
B. 100 mL
C. 150 mL
D. 200 mL
Question 4
The diagram below shows a simple black and white chemistry apparatus showing titration setup.
A. The burette contains the acid.
B. The beaker contains the acid.
C. The burette contains the base.
D. The beaker contains the base.
Question 5
A sample of O2 is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of O2 is 0.75 atm, what is the mole \fraction of O2 in the gas mixture?
A. ( 0.75 )
B. ( 0.85 )
C. ( 0.95 )
D. ( 0.99 )
Question 6
A 2.5 L flask contains 0.15 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 1.51 × 10^5 Pa
C. 2.01 × 10^5 Pa
D. 2.51 × 10^5 Pa
Question 7
A 0.500 M solution of NaOH is titrated with 0.200 M HCl. Calculate the pH of the solution after 25.0 mL of HCl has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 8
A polymer is synthesized from a monomer with the molecular formula C4H8. What is the structure of the polymer?
A. [-CH2-CH2-CH2-CH2-]n
B. [-CH2-CH2-CH2-CH2-CH2-]n
C. [-CH2-CH2-CH2-CH2-CH2-CH2-]n
D. [-CH2-CH2-CH2-CH2-CH2-CH2-CH2-]n
Question 9
A 0.500-g sample of a compound containing only carbon and oxygen is analyzed by combustion and found to contain 0.250 g of carbon and 0.250 g of oxygen. What is the empirical formula of the compound?
A. CO
B. C2O
C. C3O2
D. C4O3
Question 10
A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.75 atm, what is the mole \fraction of CO2 in the gas mixture?
A. ( 0.75 )
B. ( 0.85 )
C. ( 0.95 )
D. ( 0.99 )
Question 11
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH in a 1:1 ratio. If the reaction is allowed to go to completion, what is the resulting pH of the solution?
A. ( 7.0 )
B. ( 10.0 )
C. ( 14.0 )
D. ( 0.0 )
Question 12
Determine the molar solubility of Ag2CrO4 in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) of Ag2CrO4 is 1.1 × 10^\( -12 \) and the solubility product cons\tant (Ksp) of AgCl is 1.8 × 10^\( -10 \).
A. 1.2 × 10^\( -5 \) M
B. 2.5 × 10^\( -5 \) M
C. 4.8 × 10^\( -5 \) M
D. 6.2 × 10^\( -5 \) M
Question 13
The reaction of nitrogen dioxide with water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. If 2.5 g of NO2 is added to 10 mL of water, what is the limiting reac\tant?
A. NO2
B. H2O
C. HNO3
D. NO
Question 14
The diagram below shows a titration setup. If 25 mL of 0.1 M HCl is added to 20 mL of 0.1 M NaOH, what is the pH of the resulting solution?
A. 7
B. 9
C. 11
D. 13
Question 15
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. If the reaction is allowed to go to completion, what is the resulting pH of the solution?
A. ( 7.0 )
B. ( 10.0 )
C. ( 14.0 )
D. ( 0.0 )

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