POST UTME NILE UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. Calculate the partial pressure of CO2 in the air at a total pressure of 101.3 kPa.
A. 1.013 kPa
B. 2.026 kPa
C. 3.039 kPa
D. 4.052 kPa
Question 2
The reaction of 2,2-dimethylpropane with oxygen gas produces carbon dioxide and water. The reaction is carried out in a 1-L flask at a temperature of 25°C and a pressure of 1 atm. If the reaction is 50% complete, what is the partial pressure of oxygen gas in the flask?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.25 atm
Question 3
A 25 mL sample of a solution containing 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 4
The rate of a chemical reaction is affected by the
A. concentration of reac\tants
B. temperature of the reaction mixture
C. pressure of the reaction mixture
D. all of the above
Question 5
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 25 cm^3 of the HCl solution requires 35 cm^3 of the NaOH solution for neutralization, calculate the number of moles of NaOH in the initial solution.
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 6
The process of photosynthesis occurs in the
A. roots of a plant
B. leaves of a plant
C. stems of a plant
D. flowers of a plant
Question 7
The polymerization of styrene in the presence of benzoyl peroxide yields a polymer with a molecular weight of 50,000 g/mol. If the polymerization reaction is carried out in a solvent with a density of 0.8 g/mL, what is the volume of the polymer solution in a 2-L flask?
A. 2.5 L
B. 3.125 L
C. 4 L
D. 5 L
Question 8
The polymerization of styrene to form polystyrene is an example of a(n)
A. condensation reaction
B. addition reaction
C. substitution reaction
D. elimination reaction
Question 9
The electrolysis of water produces
A. hydrogen gas and oxygen gas
B. hydrogen gas and water
C. oxygen gas and water
D. hydrogen gas and carbon dioxide
Question 10
The diagram below shows a titration setup for the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH). If 25 mL of 0.1 M HCl is added to the flask, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 11
A 1.0 L sample of a 0.5 M solution of NaOH is mixed with a 1.0 L sample of a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 12
The element with atomic number 12 is _______.
A. Mg
B. Ca
C. Si
D. Al
Question 13
The atomic radius of an atom is the dis\tance from the nucleus to the outermost
A. proton
B. electron
C. neutron
D. nucleus
Question 14
The pH of a solution is a measure of its
A. acidity
B. basicity
C. neutrality
D. all of the above
Question 15
A diagram of a gas law setup is shown below.
A. The gas law is Boyle's Law.
B. The gas law is Charles' Law.
C. The gas law is Gay-Lussac's Law.
D. The gas law is Avogadro's Law.

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