POST UTME LASU 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50 g sample of an unknown hydrocarbon is burned in a combustion calorimeter. The volume of carbon dioxide produced is 1.25 L at 25°C and 1 atm. Calculate the empirical formula of the hydrocarbon.
A. C6H12
B. C4H8
C. C3H6
D. C2H4
Question 2
A sample of a non-metallic oxide has a mass of 25.0 g and a volume of 5.00 cm³. What is the molar mass of the oxide?
A. 50.0 g/mol
B. 100.0 g/mol
C. 150.0 g/mol
D. 200.0 g/mol
Question 3
A 100.0 mL sample of a solution containing 0.100 M NaOH is mixed with 100.0 mL of a solution containing 0.100 M HCl. What is the pH of the resulting solution?
A. 7.00
B. 6.00
C. 5.00
D. 4.00
Question 4
A solution contains 0.1 M Fe2+ ions. If 50.0 mL of 0.1 M NaOH is added to 100.0 mL of the solution, what is the concentration of Fe(OH)3 formed?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 5
In the electrolysis of molten sodium chloride, what is the primary product at the cathode?
A. Sodium
B. Chlorine
C. Sodium chloride
D. Hydrogen
Question 6
What is the pH of a solution that is 0.10 M in HCl?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 7
A 50.0 mL sample of a solution containing 0.100 M HCl is mixed with 50.0 mL of a solution containing 0.100 M NaOH. What is the pH of the resulting solution?
A. 7.00
B. 6.00
C. 5.00
D. 4.00
Question 8
A 10.0 g sample of a metal is heated in a stream of oxygen gas. If 11.2 g of the oxide is formed, what is the empirical formula of the oxide?
A. Fe2O3
B. CuO
C. ZnO
D. MnO2
Question 9
The half-life of a radioactive subs\tance is 10 years. If 100 g of the subs\tance is present initially, what is the mass of the subs\tance remaining after 30 years?
A. 6.25 g
B. 12.5 g
C. 25.0 g
D. 50.0 g
Question 10
A solution of 0.100 M NaOH is mixed with a solution of 0.100 M HCl. What is the pH of the resulting solution?
A. 7.00
B. 6.00
C. 5.00
D. 4.00
Question 11
The reaction between sodium hydroxide (NaOH) and acetic acid (CH3COOH) is represented by the equation: CH3COOH + NaOH → CH3COONa + H2O. If 25.0 mL of 0.100 M CH3COOH is mixed with 25.0 mL of 0.100 M NaOH, what is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 12
A 1.00-mol sample of a gas is confined to a 2.00-L container at a temperature of 298 K. What is the pressure of the gas in atm?
A. 0.500 atm
B. 1.00 atm
C. 1.50 atm
D. 2.00 atm
Question 13
A 2.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 14
A 2.50-g sample of a polymer is dissolved in 50.0 mL of a solvent. If the solution has a density of 1.00 g/mL, what is the concentration of the polymer in g/mL?
A. 0.0500 g/mL
B. 0.100 g/mL
C. 0.150 g/mL
D. 0.200 g/mL
Question 15
The s\tandard electrode potential of the couple Mn2+/Mn is -1.18 V. Calculate the s\tandard electrode potential of the couple MnO4-/Mn2+.
A. -0.59 V
B. -0.79 V
C. -1.18 V
D. -1.58 V

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