POST UTME GREENFIELD UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 2
Determine the number of moles of oxygen gas (O2) required to react with 2.5 moles of hydrogen gas (H2) in the following reaction: 2H2 + O2 → 2H2O.
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 3
A 2.5 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 4
A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. If 20 mL of NaOH is added, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 5
A 25.0 mL sample of a solution containing 0.500 M NaOH is mixed with 25.0 mL of a solution containing 0.500 M HCl. What is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of methane (CH4(g))?
A. -890.3 kJ/mol
B. -890.4 kJ/mol
C. -890.5 kJ/mol
D. -890.6 kJ/mol
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of methane?
A. -890.3 kJ/mol
B. -393.5 kJ/mol
C. -890.3 kJ/mol
D. -393.5 kJ/mol
Question 8
The rate cons\tant for the first-order reaction A → B is 0.05 min^-1. What is the half-life of the reaction?
A. 13.9 min
B. 27.8 min
C. 13.9 min
D. 27.8 min
Question 9
A 2.5 M solution of sodium hydroxide (NaOH) is titrated with a 0.5 M solution of hydrochloric acid (HCl). If 25 mL of the acid is required to reach the equivalence point, what is the volume of the base solution required?
A. 50 mL
B. 75 mL
C. 100 mL
D. 125 mL
Question 10
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. 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 11
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylpropene
C. 2-chloro-3-methylbu\tane
D. 2-chloro-3-methylpropane
Question 12
The polymerization of styrene to polystyrene is an example of a
A. condensation polymerization
B. addition polymerization
C. esterification
D. hydrolysis
Question 13
A mixture of 2.5 g of sodium hydroxide (NaOH) and 2.5 g of hydrochloric acid (HCl) is prepared. What is the resulting solution?
A. NaCl(aq)
B. NaOH(aq)
C. HCl(aq)
D. NaOH(aq) + HCl(aq)
Question 14
A sample of a polymer has a molecular weight of 100,000 g/mol. If the density of the polymer is 1.5 g/cm^3, what is the volume of the polymer sample?
A. 66.7 cm^3
B. 66.7 cm^3
C. 66.7 cm^3
D. 66.7 cm^3
Question 15
The diagram below shows a titration setup. Identify the part labeled A.
A. A
B. B
C. C
D. D

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: