POST UTME LAUTECH 2017 Chemistry | Objective

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Question 1
A 1.0 L solution contains 0.5 M NaOH. What is the concentration of OH- ions in the solution?
A. 0.5 M
B. 0.25 M
C. 0.1 M
D. 0.05 M
Question 2
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 12.5 mL
B. 25.0 mL
C. 37.5 mL
D. 50.0 mL
Question 3
A solution contains 0.500 M NaOH. What is the concentration of OH- ions in the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 4
A sample of a non-ideal gas is heated at cons\tant pressure. Which of the following statements is true about the change in the gas's properties?
A. The gas expands and its volume increases.
B. The gas contracts and its volume decreases.
C. The gas expands and its volume remains cons\tant.
D. The gas contracts and its volume increases.
Question 5
A 2.50 L flask contains 0.150 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 atm
B. 2.02 atm
C. 3.03 atm
D. 4.04 atm
Question 6
Determine the molar solubility of AgCl in a solution containing 0.1 M NaCl. The solubility product cons\tant (Ksp) for AgCl is 1.8 x 10^-10.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M
Question 7
Calculate the s\tandard enthalpy change \( ΔH^circ \) for the reaction: 2Al(s) + 3H_2O(g) → 2Al(OH)_3(s) + 3/2H_2(g). Given that ΔH^circ_f = -1261.3 kJ/mol for Al(OH)_3(s) and ΔH^circ_f = 0 kJ/mol for Al(s) and H_2O(g).
A. -1478.6 kJ/mol
B. -1261.3 kJ/mol
C. -1478.6 kJ/mol + 0 kJ/mol
D. -1261.3 kJ/mol + 0 kJ/mol
Question 8
The entropy of a subs\tance is a measure of its disorder or randomness. Which of the following subs\tances has the highest entropy?
A. \( \text{H}_2\text{O}\( \text{l} \ \) )
B. \( \text{CO}_2\( \text{g} \ \) )
C. \( \text{NH}_3\( \text{g} \ \) )
D. \( \text{O}_2\( \text{g} \ \) )
Question 9
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). Given that ΔH°(Al2O3(s)) = -1675 kJ/mol and ΔH°(Fe(s)) = 0 kJ/mol.
A. -1675 kJ/mol
B. -3350 kJ/mol
C. -1675 kJ/mol
D. -3350 kJ/mol
Question 10
A 2.00 L flask contains 0.200 mol of an ideal gas at 298 K. If the gas is compressed to 1.00 L, what is the new pressure of the gas?
A. 2.02 atm
B. 4.04 atm
C. 6.06 atm
D. 8.08 atm
Question 11
The s\tandard enthalpy of formation of a compound is the enthalpy change when one mole of the compound is formed from its constituent elements in their s\tandard states. Which of the following compounds has a negative s\tandard enthalpy of formation?
A. \( \text{H}_2\text{O}\( \text{l} \ \) )
B. \( \text{CO}_2\( \text{g} \ \) )
C. \( \text{NH}_3\( \text{g} \ \) )
D. \( \text{O}_2\( \text{g} \ \) )
Question 12
A 2.0 L solution contains 0.2 M HCl. What is the concentration of H+ ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.4 M
D. 0.8 M
Question 13
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution at the equivalence point?
A. 7.00
B. 7.50
C. 8.00
D. 8.50
Question 14
A 2.00 g sample of a polymer is dissolved in 100.0 mL of water. The solution has a vis\cosity of 1.50 cP. Calculate the molar mass of the polymer.
A. 1000 g/mol
B. 2000 g/mol
C. 3000 g/mol
D. 4000 g/mol
Question 15
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M

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