POST UTME UNN 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M NaCl and 0.2 M NaOH. What is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 2
The following diagram shows a graph. What is the type of relationship between the variables?
A. Direct variation
B. Inverse variation
C. Proportional variation
D. Inverse square variation
Question 3
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the concentration of the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 4
A sample of air contains 20% O2, 70% N2, and 10% CO2. What is the partial pressure of CO2 in the air?
A. 0.2 atm
B. 0.4 atm
C. 0.6 atm
D. 0.8 atm
Question 5
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 6
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane
Question 7
A 1.5 g sample of a compound is found to have a mass of 2.5 g after being dried in an oven at 120°C. What is the mass of water in the compound?
A. 0.5 g
B. 1 g
C. 1.5 g
D. 2 g
Question 8
A 1.0 M solution of H2SO4 is titrated with 0.5 M NaOH. Calculate the pH of the solution after 50 mL of NaOH has been added.
A. 1.0
B. 1.0
C. 1.0
D. 1.0
Question 9
A 1 M solution of H2SO4 is titrated with 1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 7
B. 9
C. 10
D. 12
Question 10
The polymerization of styrene produces a polymer with the following structure: [-CH2-CH(C6H5)-]n. What is the type of polymerization reaction that occurred?
A. Addition polymerization
B. Condensation polymerization
C. Ring-opening polymerization
D. Step-growth polymerization
Question 11
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. If the initial pH of the HCl solution is 1, what is the pH of the resulting solution after the reaction is complete?
A. 7
B. 9
C. 10
D. 12
Question 12
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. Calculate the s\tandard enthalpy of formation of N2(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 13
A sample of a gas has a volume of 2.5 L at 27°C and 1 atm. What is the volume of the gas at 37°C and 2 atm?
A. 1.5 L
B. 2.5 L
C. 3.5 L
D. 4.5 L
Question 14
A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl in water and diluting to a total volume of 1.00 L. What is the concentration of HCl in the solution?
A. ( 1.00 ) M
B. ( 2.00 ) M
C. ( 3.00 ) M
D. ( 4.00 ) M
Question 15
A 10.0 g sample of a compound containing only carbon and hydrogen is analyzed and found to contain 6.0 g of carbon and 4.0 g of hydrogen. What is the empirical formula of the compound?
A. CH
B. C2H
C. C3H2
D. C4H3

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