POST UTME UNIPORT 2019 Chemistry | Objective

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Question 1
A 2.50 g sample of sulfur is burned in oxygen to produce sulfur dioxide. If 1.25 g of sulfur dioxide is collected, what is the percentage yield of sulfur dioxide?
A. 50%
B. 75%
C. 50%
D. 75%
Question 2
A 25 mL sample of a colloidal solution contains 0.5 g of particles. Calculate the concentration of the particles in the solution.
A. 0.02 g/mL
B. 0.04 g/mL
C. 0.06 g/mL
D. 0.08 g/mL
Question 3
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) if the s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol and that of C(s) is 0 kJ/mol.
A. -1207.19 kJ/mol
B. -1207.19 kJ/mol
C. -1207.19 kJ/mol
D. -1207.19 kJ/mol
Question 4
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.0 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 5
Determine the s\tandard enthalpy of formation of NH3(g) from the following data: ΔHf(NH3(g)) = ?; ΔHf(H2(g)) = -285.8 kJ/mol; ΔHf(N2(g)) = 0 kJ/mol.
A. -46.1 kJ/mol
B. -92.2 kJ/mol
C. -46.1 kJ/mol
D. -92.2 kJ/mol
Question 6
A 2.50 g sample of a polymer is dissolved in 100.0 mL of a solvent. The solution is then diluted to 500.0 mL. What is the concentration of the polymer in the final solution?
A. 0.00500 M
B. 0.0100 M
C. 0.0150 M
D. 0.0200 M
Question 7
A 1.50 L flask contains 0.250 mol of an ideal gas at 50°C. Calculate the pressure of the gas in atm.
A. 1.00 atm
B. 1.00 atm
C. 1.00 atm
D. 1.00 atm
Question 8
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylbu\tane
C. 2-chloro-3-methylbu\tane
D. 2-chloro-3-methylpen\tane
Question 9
Calculate the s\tandard Gibbs free energy change for the reaction: 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g).
A. -1.2 x 10^3 J/mol
B. -1.2 x 10^3 J/mol
C. -1.2 x 10^3 J/mol
D. -1.2 x 10^3 J/mol
Question 10
A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. The resulting solution is found to be 1.0 M. Calculate the initial concentrations of NaOH and HCl.
A. \( [NaOH]_0 = 1.0 M \) and \( [HCl]_0 = 1.0 M \)
B. \( [NaOH]_0 = 2.0 M \) and \( [HCl]_0 = 2.0 M \)
C. \( [NaOH]_0 = 1.0 M \) and \( [HCl]_0 = 2.0 M \)
D. \( [NaOH]_0 = 2.0 M \) and \( [HCl]_0 = 1.0 M \)
Question 11
A metal (M) reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2MO2. If 2.00 g of M is burned in air, what is the volume of O2 consumed at STP?
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 12
The diagram below shows a titration setup.
A. The burette contains the acid.
B. The burette contains the base.
C. The beaker contains the acid.
D. The beaker contains the base.
Question 13
A solution of 0.1 M NaCl is prepared by dissolving 0.1 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
A 0.500 M solution of NaOH is titrated with 0.500 M HCl. Calculate the pH of the solution after 25.0 mL of HCl has been added.
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 15
A 1.00 L sample of a gas at 25.0°C and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.500 L
B. 0.750 L
C. 1.00 L
D. 1.25 L

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