POST UTME SUMMIT UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a cell with a salt bridge. What is the purpose of the salt bridge?
A. To prevent the mixing of the two solutions
B. To allow the flow of electrons between the two solutions
C. To maintain electrical neutrality in the solutions
D. To increase the concentration of ions in the solutions
Question 2
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 )
Question 3
A 2.50-g sample of a compound containing only carbon and hydrogen is analyzed by combustion and found to contain 1.75 g of carbon and 0.50 g of hydrogen. What is the empirical formula of the compound?
A. CH2
B. C2H4
C. C3H6
D. C4H8
Question 4
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, what is the mass of the subs\tance remaining after 10 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 5
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 )
Question 6
A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 7
A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. What is the partial pressure of CO2 in the air at 1 atm?
A. 0.1 atm
B. 0.2 atm
C. 0.3 atm
D. 0.4 atm
Question 8
A 2.0 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1 L of water. What is the pH of the solution?
A. 12
B. 13
C. 14
D. 15
Question 9
The diagram below shows a setup for a gas law experiment. If the initial volume of the gas is 2.0 L and the final volume is 4.0 L, what is the ratio of the final pressure to the initial pressure?
A. 1:2
B. 2:1
C. 3:1
D. 4:1
Question 10
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 11
The diagram below represents a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 12
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To prevent the mixing of the titrant and analyte
Question 13
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 14
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 15
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

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