POST UTME NILE UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the partial pressure of nitrogen gas?
A. 0.98 atm
B. 0.99 atm
C. 1.00 atm
D. 1.01 atm
Question 2
A 0.1 M solution of HCN is mixed with a 0.1 M solution of NaOH. What is the pH of the resulting solution?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 3
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in water to make 250 mL of solution. What is the molarity of the solution?
A. 5 M
B. 10 M
C. 2.5 M
D. 1 M
Question 4
What is the term for the process by which a molecule gains or loses electrons to form ions?
A. Ionization
B. Electron transfer
C. Protonation
D. Deprotonation
Question 5
In the context of environmental chemistry, what is the term for the movement of pollu\tants from the atmosphere to the ground?
A. Deposition
B. Runoff
C. Leaching
D. Volatilization
Question 6
A 100 mL sample of a solution containing 2.0 M H2SO4 is mixed with 100 mL of water. What is the resulting concentration of the solution?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 7
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the resulting pH?
A. 0.500
B. 0.500
C. 0.500
D. 0.500
Question 8
A 0.1 M solution of hydrochloric acid (HCl) is prepared by dissolving 3.5 g of HCl in water to make 250 mL of solution. What is the concentration of the solution in terms of molarity?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 9
A 2.5 M solution of HCl is mixed with a 1.5 M solution of NaOH. If the reaction is complete, what is the resulting concentration of the salt formed?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 10
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 0
B. 7
C. 14
D. 10
Question 11
A diagram of a chemical apparatus setup is shown below. What is the purpose of the condenser in this setup?
A. To cool the vapor
B. To heat the vapor
C. To separate the vapor from the liquid
D. To mix the vapor with the liquid
Question 12
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To slow down the reaction
Question 13
A sample of iron metal is heated in a vacuum to produce iron oxide. What is the balanced equation for this reaction?
A. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{Fe}_2\text{O}_3(s)
B. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{FeO}(s)
C. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{Fe}_3\text{O}_4(s)
D. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{Fe}_2\text{O}_2(s)
Question 14
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 10.0 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 15
The reaction between nitrogen dioxide and water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. What is the oxidation state of nitrogen in the product HNO3?
A. +5
B. +3
C. +1
D. -1

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