POST UTME LAUTECH 2022 Chemistry | Objective

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Question 1
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.6 g/L
B. 1.2 g/L
C. 1.8 g/L
D. 2.4 g/L
Question 2
A 2.0 M solution of H2SO4 is prepared by dissolving 40 g of H2SO4 in 100 mL of water. What is the concentration of H2SO4 in the solution in units of mol/L?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 3
A 0.1 M solution of NaOH is prepared by dissolving 2.0 g of NaOH in 100 mL of water. What is the concentration of NaOH in the solution in units of mol/L?
A. 0.02 M
B. 0.04 M
C. 0.06 M
D. 0.08 M
Question 4
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of HCl is required to reach the equivalence point, calculate the volume of NaOH required to reach the equivalence point.
A. 20 mL
B. 30 mL
C. 40 mL
D. 50 mL
Question 5
A 2.0 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. What is the concentration of HCl in the solution in units of mol/L?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 6
The rate cons\tant of a reaction is given by the equation: k = Ae^\( -Ea/RT \). If the rate cons\tant at 25°C is 0.05 s^\( -1 \) and at 50°C is 0.15 s^\( -1 \), calculate the activation energy (Ea) of the reaction in kJ/mol.
A. 20 kJ/mol
B. 30 kJ/mol
C. 40 kJ/mol
D. 50 kJ/mol
Question 7
A 10.0 g sample of a non-metallic oxide is heated in a crucible. The mass of the oxide decreases by 2.50 g. What is the percentage decrease in mass?
A. 12.5%
B. 25.0%
C. 37.5%
D. 50.0%
Question 8
A 2.5 g sample of sulfur is burned in oxygen to form sulfur dioxide. If the reaction is complete, what is the volume of sulfur dioxide produced at STP?
A. 1.2 L
B. 2.4 L
C. 3.6 L
D. 4.8 L
Question 9
The reaction of ammonia with oxygen produces nitrogen monoxide and water. What is the balanced equation for this reaction?
A. 4NH3 + 5O2 → 4NO + 6H2O
B. 2NH3 + 3O2 → 2NO + 3H2O
C. NH3 + O2 → NO + H2O
D. 2NH3 + O2 → 2NO + 2H2O
Question 10
A 0.1 M solution of glu\cose (C6H12O6) is prepared by dissolving 2.0 g of glu\cose in 100 mL of water. What is the concentration of glu\cose in the solution in units of mol/L?
A. 0.02 M
B. 0.04 M
C. 0.06 M
D. 0.08 M
Question 11
A metal (M) reacts with oxygen to form a basic oxide. The reaction is: 4M + 3O2 → 2MO3. If 2.5 g of M reacts with 3.5 g of O2, calculate the percentage yield of MO3.
A. 80%
B. 90%
C. 95%
D. 98%
Question 12
A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant volume. What is the final pressure of the gas in atm?
A. 1.5 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 13
Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) of AgCl is 1.8 × 10^-10.
A. 1.0 × 10^-5 M
B. 1.5 × 10^-5 M
C. 2.0 × 10^-5 M
D. 3.0 × 10^-5 M
Question 14
The reaction between nitrogen dioxide and ozone is as follows: 2NO2(g) + O3(g) → 2NO3(g) + O2(g). What is the rate law for this reaction?
A. rate = k[NO2][O3]
B. rate = k[NO2]^2[O3]
C. rate = k[NO2][O3]^2
D. rate = k[NO2]^2[O3]^2
Question 15
A 2.0 L sample of a gas at 25°C and 1 atm is compressed to 0.5 L at 50°C. What is the final pressure of the gas in atm?
A. 2 atm
B. 4 atm
C. 6 atm
D. 8 atm

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