POST UTME UNIBEN 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. Calculate the molar concentration of the solution.
A. 0.6 M
B. 0.8 M
C. 1.0 M
D. 1.2 M
Question 2
A sample of hydrogen gas (H2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, calculate the partial pressure of the hydrogen gas.
A. 0.5 atm
B. 0.7 atm
C. 0.9 atm
D. 1.1 atm
Question 3
A solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in 100 mL of water. If the molar concentration of the solution is 1.5 M, calculate the volume of the solution required to neutralize 50 mL of 0.5 M hydrochloric acid (HCl).
A. 20 mL
B. 30 mL
C. 40 mL
D. 50 mL
Question 4
A sample of a metal oxide is heated in a crucible. The resulting gas is collected and found to be carbon dioxide. What is the metal oxide?
A. CaO
B. MgO
C. Al2O3
D. Fe2O3
Question 5
A sample of a metal is heated in a crucible. The resulting gas is collected and found to be hydrogen gas. What is the metal?
A. Zn
B. Mg
C. Al
D. Fe
Question 6
The reaction of 2,2-dimethylpropane with chlorine gas in the presence of light results in the formation of 1,1-dichloro-2,2-dimethylpropane. What is the major product formed in the reaction?
A. 1,1-dichloro-2,2-dimethylpropane
B. 1,2-dichloro-2,2-dimethylpropane
C. 2,2-dimethylpropane
D. chlorine gas
Question 7
A metal rod is heated to a temperature of 800°C and then quenched in water. If the metal has a specific heat capacity of 0.5 J/g°C, calculate the temperature of the metal after quenching.
A. 20°C
B. 30°C
C. 40°C
D. 50°C
Question 8
A sample of oxygen gas (O2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 3.2 L, calculate the partial pressure of the oxygen gas.
A. 0.7 atm
B. 0.9 atm
C. 1.1 atm
D. 1.3 atm
Question 9
A solution of sodium hydroxide is added to a solution of sulfuric acid. The resulting solution is basic. What is the pH of the solution?
A. 1
B. 2
C. 7
D. 10
Question 10
A solution of sodium hydroxide is added to a solution of acetic acid. The resulting solution is acidic. What is the pH of the solution?
A. 1
B. 2
C. 7
D. 10

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