POST UTME GREENFIELD UNIVERSITY 2022 Chemistry | Objective

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Question 1
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 2
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 3
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. Determine the pH of the resulting solution.
A. pH 7
B. pH 9
C. pH 10
D. pH 11
Question 4
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 5
Determine the molar mass of the polymer polyethylene, given that its repeating unit is \( -CH_2-CH_2- \) and the atomic masses of carbon and hydrogen are 12.01 g/mol and 1.008 g/mol, respectively.
A. 56.11 g/mol
B. 28.06 g/mol
C. 14.03 g/mol
D. 112.14 g/mol
Question 6
A sample of water contains 10 ppm of dissolved oxygen. If the sample is collected in a 100 mL bottle, what is the mass of oxygen in the sample?
A. 0.01 g
B. 0.1 g
C. 1.0 g
D. 10 g
Question 7
A 0.500 g sample of a non-metallic oxide, X2O3, is dissolved in 0.500 L of water to form a solution. If the concentration of the solution is 0.100 M, 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 8
A 2.5 L flask contains 0.2 mol of an ideal gas at 27°C. Calculate the pressure (P) of the gas in atm.
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 9
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 10
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 chloride ions in the solution after the titration?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 11
A diagram of a redox reaction is shown below:\n\n[Insert diagram of redox reaction]\n\nWhat is the oxidation state of the sulfur atom in the compound SO42-?
A. +2
B. +4
C. +6
D. +8
Question 12
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 13
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 14
A 1.00 g sample of a non-metallic oxide of nitrogen is heated in a stream of hydrogen gas. The resulting gas is collected and found to have a volume of 1.00 L at 25°C and 1 atm. If the oxide is assumed to be N2O, calculate the mass of N2O that reacted.
A. 10.0 g
B. 20.0 g
C. 30.0 g
D. 40.0 g
Question 15
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4

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