POST UTME UI 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase in this setup?
A. To separate the components of a mixture
B. To identify the components of a mixture
C. To purify a subs\tance
D. To analyze the properties of a subs\tance
Question 2
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 3
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
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 4
A 100-g sample of a non-metallic compound is found to have a mass of 25 g when heated in a vacuum. What is the molar mass of the compound?
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 5
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1206.5 kJ/mol
B. -1206.0 kJ/mol
C. -1207.0 kJ/mol
D. -1208.0 kJ/mol
Question 6
Determine the number of moles of glu\cose (C6H12O6) that can be obtained from 2.5 L of a 0.5 M glu\cose solution.
A. 0.125 mol
B. 0.25 mol
C. 0.5 mol
D. 1.0 mol
Question 7
A diagram of a gas law setup is shown below. If the pressure is increased from 1 atm to 2 atm, what is the new volume of the gas?
A. 1
B. 2
C. 3
D. 4
Question 8
A diagram of a titration setup is shown below. If 20 mL of 0.1 M HCl is added to the burette, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 9
A 10.0 mL sample of a 0.100 M solution of HCl is mixed with a 10.0 mL sample of a 0.100 M solution of NaOH. What is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 8.50
Question 10
A 10.0 mL sample of a 0.100 M solution of NaOH is mixed with a 10.0 mL sample of a 0.100 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 8.50
Question 11
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is added to the burette, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 12
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
D. 4
Question 13
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the number of moles of H2SO4.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 14
Determine the molar mass of a polymer with the following monomer units: CH2=CH-CH3, CH2=CH-CH2-CH3, and CH2=CH-CH2-CH2-CH3. Assume the polymer has a degree of polymerization of 100.
A. 500 g/mol
B. 750 g/mol
C. 1000 g/mol
D. 1250 g/mol
Question 15
A 2.0 M solution of sulfuric acid (H2SO4) is mixed with a 2.0 M solution of sodium hydroxide (NaOH). What is the resulting concentration of the acid-base reaction?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

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