POST UTME CHRISTOPHER UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.00-g sample of a metal is heated in a crucible until it is completely oxidized. The resulting oxide is then dissolved in 50.0 mL of 0.100 M HCl. The resulting solution is then titrated with 0.100 M NaOH. If 15.0 mL of NaOH is required to reach the equivalence point, what is the molar mass of the metal?
A. 25 g/mol
B. 37.5 g/mol
C. 50 g/mol
D. 62.5 g/mol
Question 2
The reaction of ozone (O3) with nitrogen dioxide (NO2) is a classic example of a redox reaction. Write the balanced chemical equation for this reaction.
A. 2O3 + 2NO2 → 2O2 + 2NO
B. 2O3 + 2NO2 → 2O2 + 2N2O
C. 2O3 + 2NO2 → 2O2 + 2NO3
D. 2O3 + 2NO2 → 2O2 + 2N2O3
Question 3
A redox reaction involves the transfer of electrons from a species with a higher reduction potential to a species with a lower reduction potential. Which of the following species is likely to be reduced in the reaction?
A. Cu
B. Zn
C. Cu^+
D. Zn^+
Question 4
The boiling point of a solution containing 10.0 g of glu\cose (C6H12O6) in 100.0 g of water is 100.5°C. What is the molality of the solution?
A. 0.50 m
B. 0.75 m
C. 1.00 m
D. 1.25 m
Question 5
A 25.0 mL sample of a 0.10 M solution of NaOH is titrated with 0.10 M HCl. What is the pH of the solution after adding 25.0 mL of HCl?
A. 1.3
B. 2.3
C. 3.3
D. 4.3
Question 6
A 25.0 mL sample of a 0.10 M solution of NaOH is titrated with 0.10 M HCl. What is the pH of the solution after adding 25.0 mL of HCl?
A. 1.3
B. 2.3
C. 3.3
D. 4.3
Question 7
In the electrolysis of a solution of copper(II) sulfate, what is the primary function of the anode?
A. To produce oxygen gas
B. To produce copper metal
C. To facilitate the flow of electrons
D. To increase the concentration of copper(II) ions
Question 8
A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. What is the resulting concentration of HCl?
A. 0.5
B. 1
C. 1.5
D. 2
Question 9
A solution of HCl is titrated with NaOH. The initial pH of the solution is 2.00. What is the pH after the addition of 25.0 mL of 0.100 M NaOH?
A. 3.00
B. 4.00
C. 5.00
D. 6.00
Question 10
A solution of potassium permanganate is added to a solution of oxalic acid. What is the color change observed?
A. The solution turns colorless
B. The solution turns pink
C. The solution turns purple
D. The solution turns blue
Question 11
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. What is the reaction that occurs at the equivalence point?
A. 2NaOH + HCl → NaCl + H2O
B. NaOH + HCl → NaCl + H2O
C. 2NaOH + 2HCl → 2NaCl + 2H2O
D. NaOH + 2HCl → NaCl + H2O
Question 12
A 2.0 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the root mean square speed of the gas molecules.
A. 1.43 × 10^2 m s^-1
B. 1.43 × 10^3 m s^-1
C. 1.43 × 10^4 m s^-1
D. 1.43 × 10^5 m s^-1
Question 13
A sample of a gas at 25°C and 1 atm is collected over water at 25°C. What is the partial pressure of the gas?
A. 1 atm
B. 0.5 atm
C. 0.75 atm
D. 1.25 atm
Question 14
A 2.5 L flask contains 0.050 M NaOH. What is the pH of the solution after adding 25.0 mL of 0.10 M HCl?
A. 1.3
B. 2.3
C. 3.3
D. 4.3
Question 15
A polymer has a molecular weight of 100,000 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 1.00 g/L
B. 2.00 g/L
C. 3.00 g/L
D. 4.00 g/L

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