POST UTME COVENANT UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.00 M solution of potassium nitrate is mixed with a 2.00 M solution of sodium chloride. What is the concentration of the resulting solution?
A. 1.00 M
B. 1.50 M
C. 2.00 M
D. 2.50 M
Question 2
A 2.50 M solution of sodium hydroxide is mixed with a 1.00 M solution of hydrochloric acid. What is the concentration of the resulting solution?
A. 1.75 M
B. 2.25 M
C. 2.50 M
D. 3.00 M
Question 3
A sample of a metal has a mass of 30.0 g and a volume of 10.0 mL. What is the density of the element?
A. 3.00 g/mL
B. 3.50 g/mL
C. 4.00 g/mL
D. 4.50 g/mL
Question 4
The diagram below shows a setup for the electrolysis of water. What is the purpose of the anode in this setup?
A. To release oxygen gas
B. To release hydrogen gas
C. To release chlorine gas
D. To release bromine gas
Question 5
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol H2
C. 0 kJ/mol O2
D. 0 kJ/mol H2O
Question 6
A sample of a hydrocarbon, C_xH_y, has a molecular weight of 42 g/mol. If 1.5 g of the sample is burned in a combustion tube, 1.2 L of CO2 and 0.9 L of H2O are produced at STP. What is the empirical formula of the hydrocarbon?
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Question 7
A 5.00 g sample of a metal hydroxide is treated with 20.0 mL of 1.00 M HCl. Calculate the mass of the metal chloride produced.
A. 2.50 g
B. 3.00 g
C. 3.50 g
D. 4.00 g
Question 8
A solution contains 0.250 M NaCl and 0.150 M CaCl2. Calculate the total concentration of ions in the solution.
A. 0.400 M
B. 0.450 M
C. 0.500 M
D. 0.550 M
Question 9
A 0.1 M solution of a weak base, B, has a pH of 8.5. If 10 mL of 1 M HCl is added to 90 mL of the base solution, what is the pH of the resulting solution?
A. 7.5
B. 8.5
C. 9.5
D. 10.5
Question 10
The reaction between sulfur dioxide and oxygen to form sulfur trioxide is highly exothermic. What is the value of ΔH for this reaction, given that the s\tandard enthalpy of formation of SO2 is -296.8 kJ/mol and the s\tandard enthalpy of formation of SO3 is -395.7 kJ/mol?
A. -99.9 kJ/mol
B. -99.1 kJ/mol
C. -98.3 kJ/mol
D. -97.5 kJ/mol
Question 11
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The mass of the metal oxide produced is 2.00 g. Calculate the percentage yield of the metal oxide.
A. 80.0%
B. 85.0%
C. 90.0%
D. 95.0%
Question 12
The reaction between sodium and chlorine produces a white solid. What is the name of the compound formed?
A. Sodium chloride
B. Chlorine gas
C. Sodium gas
D. Chlorine solid
Question 13
The pH of a solution is 4.25. Calculate the concentration of H+ ions in the solution.
A. 1.0 x 10^-4 M
B. 1.0 x 10^-5 M
C. 1.0 x 10^-6 M
D. 1.0 x 10^-7 M
Question 14
A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. Calculate the pH of the solution after 10 mL of HCl has been added.
A. 1
B. 2
C. 3
D. 4
Question 15
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4

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