POST UTME DELSU 2019 Chemistry | Objective

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Question 1
A sample of a polymer is analyzed by infrared spectroscopy. What is the expected frequency of the C-H stretching vibration?
A. 2800 cm^-1
B. 3000 cm^-1
C. 3200 cm^-1
D. 3400 cm^-1
Question 2
A 10 mL sample of a 0.05 M solution of Fe2+ is mixed with 10 mL of a 0.05 M solution of MnO4-. If the initial concentration of Fe2+ is 0.05 M, what is the concentration of Fe3+ after the reaction is complete?
A. 0.02 M
B. 0.03 M
C. 0.04 M
D. 0.05 M
Question 3
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 25.0 g of NaOH in 1.0 L of water. Calculate the concentration of the solution in units of molarity (M) if 25.0 g of NaOH is dissolved in 1.0 L of water.
A. 1.0 M
B. 2.0 M
C. 2.5 M
D. 5.0 M
Question 4
A 0.50 M solution of sodium carbonate (Na2CO3) is prepared by dissolving 25.0 g of Na2CO3 in 1.0 L of water. Calculate the concentration of the solution in units of molarity (M) if 25.0 g of Na2CO3 is dissolved in 1.0 L of water.
A. 0.25 M
B. 0.50 M
C. 1.0 M
D. 1.5 M
Question 5
Calculate the pH of a solution containing 0.1 M HCl and 0.1 M NaOH. The dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
D. 4
Question 6
A 10 mL sample of 0.1 M FeSO4 is electrolyzed for 5 minutes. Calculate the mass of Fe deposited.
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 7
A solution contains 0.1 M NaCl and 0.1 M KNO3. Calculate the boiling point elevation.
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 8
A gas at 25°C and 1 atm is compressed to 2 atm. If the volume of the gas is reduced by a factor of 2, what is the new temperature of the gas?
A. 50°C
B. 75°C
C. 100°C
D. 125°C
Question 9
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a weak base B. If the resulting solution has a pH of 4.5, what is the value of the acid dissociation cons\tant Ka?
A. \( 10^{-4} \)
B. \( 10^{-5} \)
C. \( 10^{-6} \)
D. \( 10^{-7} \)
Question 10
A 25 mL sample of a 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. If the initial pH of the NaOH solution is 12.5, what is the pH of the resulting solution after the reaction is complete?
A. 1.5
B. 2.5
C. 3.5
D. 4.5
Question 11
A sample of ethanol is analyzed by gas chromatography. What is the expected retention time of the ethanol?
A. 2.5 minutes
B. 5.0 minutes
C. 7.5 minutes
D. 10.0 minutes
Question 12
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase in this setup?
A. To separate the components of a mixture
B. To identify the components of a mixture
C. To measure the concentration of a component
D. To measure the pH of a solution
Question 13
A sample of polystyrene is dissolved in toluene. What is the expected molecular weight of the polystyrene?
A. 100,000 g/mol
B. 500,000 g/mol
C. 1,000,000 g/mol
D. 5,000,000 g/mol
Question 14
A solution containing 0.50 M HCl and 0.50 M NaOH is prepared. What is the pH of the solution?
A. 0.0
B. 1.0
C. 7.0
D. 14.0
Question 15
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C6H12O6(s).
A. -2800
B. -2900
C. -3000
D. -3100

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