POST UTME NILE UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of a non-electrolyte solute in water is 0.5 M. What is the expected boiling point of the solution?
A. 0.5°C
B. 1.0°C
C. 1.5°C
D. 2.0°C
Question 2
Determine the solubility of CaF2 in water at 25°C, given that the solubility product cons\tant (Ksp) is 3.9 × 10^-11. The molar mass of CaF2 is 78.08 g/mol.
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 3
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. 0.2 M
D. 0.5 M
Question 4
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 250 g/mol
B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol
Question 5
A 0.1 M solution of a weak acid HA has a pH of 4.5. Calculate the concentration of the conjugate base A-.
A. 0.01 M
B. 0.1 M
C. 1 M
D. 10 M
Question 6
A 50 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 7
A 50 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 1
B. 2
C. 3
D. 4
Question 8
A 1.0 M solution of a strong acid HCl has a pH of 0. Calculate the concentration of H+ ions in the solution.
A. 1.0 M
B. 10 M
C. 100 M
D. 1000 M
Question 9
A sample of a non-metallic element, when heated in oxygen, forms a white solid. The solid is soluble in water and has a characteristic pungent smell. What is the most likely element?
A. Sulfur
B. Phosphorus
C. Nitrogen
D. Chlorine
Question 10
A diagram of a simple harmonic motion is shown below. If the amplitude of the motion is 5cm and the frequency is 2Hz, what is the angular frequency?
A. 10rad/s
B. 20rad/s
C. 30rad/s
D. 40rad/s
Question 11
A 10.0 g sample of sulfur is burned in oxygen to produce sulfur dioxide. Calculate the volume of oxygen gas consumed at STP.
A. 2.00 L
B. 4.00 L
C. 6.00 L
D. 8.00 L
Question 12
A 1.0 L flask contains 0.5 mol of CO2 at 27°C. Calculate the partial pressure of CO2.
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 13
The reaction between H2O2 and NaOH is represented by the equation: H2O2 + 2NaOH → Na2O2 + 2H2O. What is the limiting reac\tant if 25.0 mL of 0.100 M H2O2 is mixed with 25.0 mL of 0.100 M NaOH?
A. H2O2
B. NaOH
C. Na2O2
D. H2O
Question 14
A 1.00 L solution contains 0.100 mol of C6H12O6. What is the molarity of the solution?
A. 0.100 M
B. 0.500 M
C. 1.00 M
D. 2.00 M
Question 15
A diagram of a titration setup is shown below. If 25mL of 0.1M HCl is added to 25mL of 0.1M NaOH, what is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10

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