POST UTME NOUN 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the number of moles of CO2 produced when 2.5 g of calcium carbonate (CaCO3) is heated in a crucible.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 2
A polymer has a molecular weight of 5000 g/mol. Calculate the number of monomer units in the polymer.
A. 1000
B. 500
C. 250
D. 125
Question 3
A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 4
A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the expected product at the cathode?
A. H2
B. O2
C. Na
D. Cl2
Question 5
A solution of 0.1 M sodium hydroxide is titrated with 0.1 M hydrochloric acid. What is the pH of the resulting solution after 75 mL of hydrochloric acid has been added?
A. 7
B. 8
C. 9
D. 10
Question 6
A 2 M solution of HCl is mixed with a 2 M solution of NaOH. What is the pH of the resulting solution?
A. 0
B. 1
C. 2
D. 3
Question 7
A 1.0 L sample of a gas at 2.0 atm and 25°C is collected over water at 25°C. If the partial pressure of water vapor is 0.02 atm, what is the mole \fraction of the gas?
A. 0.98
B. 0.99
C. 0.995
D. 0.998
Question 8
A 25 mL sample of a 0.5 M solution of NaOH is titrated with 0.1 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.0125
B. 0.025
C. 0.0375
D. 0.05
Question 9
A 2.50 M solution of HCl is mixed with a 1.00 M solution of NaOH. Calculate the pH of the resulting solution after the reaction is complete.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A solution of 0.1 M sodium hydroxide is titrated with 0.1 M hydrochloric acid. What is the pH of the resulting solution after 100 mL of hydrochloric acid has been added?
A. 7
B. 8
C. 9
D. 10
Question 11
A mixture of 2.5 g of sodium hydroxide and 2.5 g of sodium carbonate is dissolved in 100 mL of water. What is the expected product of the reaction between the sodium hydroxide and the sodium carbonate?
A. sodium bicarbonate
B. sodium carbonate
C. sodium hydroxide
D. carbon dioxide
Question 12
A solution of NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. Calculate the molarity of the solution.
A. 0.1
B. 0.5
C. 1
D. 2
Question 13
The atomic radius of a certain element is 100 pm. If the element has an atomic number of 20, what is the number of protons in the nucleus of the atom?
A. 10
B. 20
C. 30
D. 40
Question 14
A mixture of 2.5 g of sodium hydroxide and 2.5 g of sodium carbonate is dissolved in 100 mL of water. What is the pH of the resulting solution?
A. 9
B. 10
C. 11
D. 12
Question 15
A 1 M solution of NaOH is titrated with 1 M HCl. If 25 mL of HCl is required to reach the equivalence point, what is the concentration of NaOH in the resulting solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M

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