POST UTME BELLS UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction of sodium with chlorine is represented by the equation: 2Na + Cl2 → 2NaCl. What is the type of reaction that occurs in this equation?
A. Synthesis reaction
B. Decomposition reaction
C. Single displacement reaction
D. Double displacement reaction
Question 2
A metal rod of length 20 cm and radius 1 cm is heated from 20°C to 100°C. If the coefficient of linear expansion is 10 × 10^\( -6 \) K^\( -1 \), what is the change in length of the rod?
A. 0.2 cm
B. 0.4 cm
C. 0.6 cm
D. 0.8 cm
Question 3
The half-reaction method is a technique used to balance redox reactions. Which of the following steps is part of the half-reaction method?
A. Identifying the oxidizing and reducing agents
B. Balancing the charges on both sides of the equation
C. Adding H2O to the equation
D. Adding H+ to the equation
Question 4
A solution of 0.1 M NaOH is prepared by dissolving 6.0 g of NaOH in 100 mL of water. What is the concentration of the solution in g/L?
A. 6 g/L
B. 12 g/L
C. 18 g/L
D. 24 g/L
Question 5
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 6 g/L
B. 12 g/L
C. 18 g/L
D. 24 g/L
Question 6
The s\tandard enthalpy of formation of a compound is the change in enthalpy that occurs when one mole of the compound is formed from its constituent elements in their s\tandard states. Which of the following compounds has a negative s\tandard enthalpy of formation?
A. CO2
B. H2O
C. NH3
D. CH4
Question 7
A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas in the flask?
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 8
A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the volume of the gas in the flask?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 9
A solution of 0.1 M HCl is prepared by dissolving 6.0 g of HCl in 100 mL of water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 10
The reaction between sulfuric acid and sodium hydroxide is a classic example of a double displacement reaction. The balanced chemical equation for this reaction is: H2SO4 + 2NaOH → Na2SO4 + 2H2O. What is the oxidation state of sulfur in the product Na2SO4?
A. 0
B. 2
C. 4
D. 6
Question 11
The diagram below shows the structure of a molecule. What is the type of bond that exists between the two atoms labeled A and B?
A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Van der Waals force
Question 12
A 3.0 L flask contains 0.8 mol of an ideal gas at a temperature of 320 K. What is the pressure of the gas in the flask?
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 13
The reaction of nitrogen dioxide with 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. +4
D. +6
Question 14
The non-metals are a group of elements that are located in the upper right corner of the periodic table. Which of the following non-metals is a noble gas?
A. Carbon
B. Nitrogen
C. Oxygen
D. Argon
Question 15
A 1.0 L flask contains 0.5 mol of carbon dioxide gas (CO2) at a temperature of 298 K. What is the volume of the flask if the pressure is 1.0 atm?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L

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