POST UTME BELLS UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M NaCl. What is the concentration of Cl- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 2
The polymerization of styrene in the presence of a free radical initiator yields a polymer with a molecular weight of 50,000 g/mol. If the degree of polymerization is 200, what is the molar mass of the monomer?
A. 250 g/mol
B. 125 g/mol
C. 50 g/mol
D. 25 g/mol
Question 3
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 4
The solubility of a subs\tance is a measure of its ability to dissolve in a solvent. Which of the following statements about the solubility of a subs\tance is correct?
A. The solubility of a subs\tance is directly proportional to its molecular weight.
B. The solubility of a subs\tance is inversely proportional to its molecular weight.
C. The solubility of a subs\tance is indep\endent of its molecular weight.
D. The solubility of a subs\tance is directly proportional to the temperature of the solvent.
Question 5
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 6
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 7
A 2.00-g sample of a non-metallic oxide of sulfur is decomposed by heating with graphite at 573 K. If 1.25 g of sulfur dioxide gas is collected at STP, calculate the empirical formula of the oxide.
A. SO2
B. SO3
C. S2O3
D. S2O6
Question 8
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 9
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 10
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
Question 11
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 12
A 2.00-g sample of a non-metallic oxide of nitrogen is decomposed by heating with graphite at 573 K. If 1.25 g of nitrogen gas is collected at STP, calculate the empirical formula of the oxide.
A. N2O
B. NO2
C. N2O3
D. N2O5
Question 13
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 14
A 2.50-g sample of a non-metallic oxide of nitrogen is decomposed by heating with graphite at 573 K. If 1.25 g of nitrogen gas is collected at STP, calculate the empirical formula of the oxide.
A. N2O
B. NO2
C. N2O3
D. N2O5
Question 15
A 2.0 L flask contains 0.5 mol of an ideal gas at a temperature of 300 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

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