POST UTME UNIPORT 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50-g sample of a polymer is dissolved in 250 mL of a solvent. If the density of the polymer is 1.25 g/mL, what is the volume of the solution in liters?
A. 0.50 L
B. 1.00 L
C. 1.25 L
D. 2.00 L
Question 2
A solution of NaOH is added to a solution of HCl. The resulting solution is a salt and water. What is the pH of the resulting solution?
A. 1
B. 2
C. 7
D. 14
Question 3
The reaction between chlorine gas and sodium hydroxide solution produces a compound with the formula NaClO. What is the oxidation state of chlorine in this compound?
A. 0
B. -1
C. +1
D. +2
Question 4
A diagram of a chemical apparatus is shown below. What is the purpose of the test tube?
A. To mix the reac\tants
B. To heat the reac\tants
C. To cool the reac\tants
D. To filter the reac\tants
Question 5
A solution of NaOH is 0.20 M. If 50.0 mL of this solution is titrated with 0.10 M HCl, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
The diagram below shows a simple black and white chemistry apparatus showing a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Erlenmeyer Flask
Question 7
The compound C6H12O6 is a sugar that can be oxidized to form a compound with the formula C6H12O6. What is the oxidation state of carbon in this compound?
A. +2
B. +3
C. +4
D. +5
Question 8
A solution of HCl is 0.10 M. If 25.0 mL of this solution is titrated with 0.20 M NaOH, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
At 298 K, the s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -111.6 kJ/mol. Calculate the equilibrium cons\tant (K) for this reaction.
A. 1.8 × 10^10
B. 1.8 × 10^5
C. 1.8 × 10^2
D. 1.8 × 10^-2
Question 10
A 1.00-g sample of a subs\tance is dissolved in 100 mL of water. If the density of the solution is 1.25 g/mL, what is the molarity of the solution?
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 11
A 2.5 L flask contains 0.15 mol of an ideal gas at 298 K. Calculate the pressure of the gas in the flask.
A. 1.2 × 10^5 Pa
B. 1.2 × 10^4 Pa
C. 1.2 × 10^3 Pa
D. 1.2 × 10^2 Pa
Question 12
The half-reaction for the reduction of Cr2O72- is: Cr2O72- + 14H+ + 6e- → 2Cr3+ + 7H2O. Determine the s\tandard reduction potential of Cr3+.
A. -0.74 V
B. -0.84 V
C. -0.94 V
D. -1.04 V
Question 13
A 0.1 M solution of a monoprotic acid, HA, is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of the acid.
A. 0.1 M
B. 0.01 M
C. 0.001 M
D. 0.0001 M
Question 14
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas, given that the gas cons\tant R = 0.0821 L atm K-1 mol-1.
A. 1.01 atm
B. 1.05 atm
C. 1.10 atm
D. 1.15 atm
Question 15
Determine the oxidation state of the central atom in the compound [Cr(H2O)6]Cl2.
A. +3
B. +2
C. +6
D. +1

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