POST UTME BOWEN UNIVERSITY 2021 Chemistry | Objective

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Question 1
The reaction between sulfuric acid and sodium hydroxide is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 50.0 g of H2SO4 is added to 100.0 g of NaOH, what is the limiting reac\tant?
A. H2SO4
B. NaOH
C. Neither
D. Both
Question 2
The s\tandard electrode potential of the couple Mn2+/Mn is -1.18 V. Calculate the s\tandard electrode potential of the couple MnO42-/Mn2+.
A. -0.90 V
B. -1.18 V
C. -1.35 V
D. -1.50 V
Question 3
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. Calculate the pH of the resulting solution.
A. 7
B. 8
C. 9
D. 10
Question 4
A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 5
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of the HCl solution is added to 100 mL of the NaOH solution, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 6
A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. If 50 mL of the H2SO4 solution is added to 100 mL of the NaOH solution, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 7
A solution of 0.10 M NaCl is prepared by dissolving 10.0 g of NaCl in 1.0 L of water. Calculate the concentration of Cl- ions in the solution.
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 8
A 25.0 mL sample of a solution containing 0.150 M NaCl is diluted to a total volume of 100.0 mL. What is the concentration of the resulting solution?
A. 0.0075 M
B. 0.015 M
C. 0.030 M
D. 0.075 M
Question 9
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 200 g/mol
B. 400 g/mol
C. 500 g/mol
D. 600 g/mol
Question 10
The half-life of a radioactive subs\tance is 5.00 years. If a sample initially contains 100 g of the subs\tance, what is the mass remaining after 10.0 years?
A. 12.5 g
B. 25.0 g
C. 50.0 g
D. 100 g
Question 11
A diagram of a titration setup is shown below. The burette contains 0.1 M HCl, and the flask contains 25.0 mL of 0.1 M NaOH. What is the volume of HCl required to reach the equivalence point?
A. 10.0 mL
B. 20.0 mL
C. 30.0 mL
D. 40.0 mL
Question 12
A 1.00-L sample of a gas at 25.0°C and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.500 L
B. 1.00 L
C. 2.00 L
D. 4.00 L
Question 13
A 2.50 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. The resulting CO2 and H2O are collected and weighed. If the mass of CO2 is 1.25 g and the mass of H2O is 0.500 g, what is the empirical formula of the compound?
A. CH2
B. CH4
C. C2H6
D. C3H8
Question 14
The rate cons\tant of a first-order reaction is 0.05 min^-1. Calculate the half-life of the reaction.
A. 10 min
B. 20 min
C. 30 min
D. 40 min
Question 15
A 2.0 M solution of hydrochloric acid (HCl) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0

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