POST UTME GREENFIELD UNIVERSITY 2022 Chemistry | Objective

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Question 1
A diagram of a solubility curve is shown below:\n\n[Insert diagram of solubility curve]\n\nWhat is the solubility of NaCl at 25°C?
A. 10 g/100 mL
B. 20 g/100 mL
C. 30 g/100 mL
D. 40 g/100 mL
Question 2
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. Determine the resulting pH of the solution.
A. pH 1
B. pH 2
C. pH 3
D. pH 4
Question 3
A 0.1 M solution of H2SO4 is titrated with a 0.1 M solution of NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 4
A sample of a non-metallic oxide, X2O3, has a mass of 0.500 g and a volume of 0.250 cm^3. If the density of the sample is 2.50 g/cm^3, what is the molar mass of the oxide?
A. 78.0 g/mol
B. 92.0 g/mol
C. 106.0 g/mol
D. 120.0 g/mol
Question 5
A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4
Question 6
A 0.1 M solution of sodium hydroxide (NaOH) is titrated with 0.1 M hydrochloric acid (HCl). Calculate the pH of the solution after 25 mL of HCl has been added.
A. 2.0
B. 3.0
C. 4.0
D. 5.0
Question 7
A 2.5-g sample of sulfur is burned in oxygen to produce sulfur dioxide. If the reaction is 100% efficient, what is the volume of sulfur dioxide produced at STP?
A. 1.2 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 8
A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the polymer solution in g/L?
A. 0.25 g/L
B. 0.50 g/L
C. 1.0 g/L
D. 2.0 g/L
Question 9
A 0.500 L sample of a solution containing 0.100 M NaCl is titrated with 0.100 M AgNO3. What is the concentration of the silver ions in the solution after the titration?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 10
Determine the s\tandard potential of the cell represented by the following reaction: Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s). Given that the s\tandard potential of Zn2+/Zn is -0.76 V and the s\tandard potential of Ag+/Ag is 0.80 V.
A. -0.04 V
B. 0.04 V
C. 0.80 V
D. -0.76 V
Question 11
A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 mL of water. If the density of the solution is 1.05 g/mL, calculate the molarity of the solution.
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 12
A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 13
A 0.1 M solution of FeCl3 is mixed with a 0.1 M solution of NaOH. Determine the resulting pH of the solution.
A. pH 1
B. pH 2
C. pH 3
D. pH 4
Question 14
A 2.0 g sample of a metal oxide is heated in a crucible until it decomposes completely. If the mass of the metal obtained is 0.8 g, and the molar mass of the metal is 40 g/mol, what is the molar mass of the metal oxide?
A. 80 g/mol
B. 120 g/mol
C. 160 g/mol
D. 200 g/mol
Question 15
The pH of a solution is given by the equation: pH = -\log[H+]. If the concentration of hydrogen ions is 1.0 x 10^-5 M, calculate the pH of the solution.
A. 4.0
B. 5.0
C. 6.0
D. 7.0

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