POST UTME MOUNTAIN TOP UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the concentration of the solution after mixing?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 2
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 7
B. 6
C. 5
D. 4
Question 3
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the solution after mixing?
A. 7
B. 6
C. 5
D. 4
Question 4
A 1.0 L flask contains 0.5 mol of an ideal gas at 50°C. What is the pressure of the gas?
A. 2.0 atm
B. 2.5 atm
C. 3.0 atm
D. 3.5 atm
Question 5
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol + 393.5 kJ/mol
C. -110.5 kJ/mol - 393.5 kJ/mol
D. -110.5 kJ/mol + 393.5 kJ/mol
Question 7
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 7
B. 6
C. 5
D. 4
Question 8
Calculate the molar mass of a compound with the empirical formula C2H4O.
A. 28
B. 40
C. 56
D. 72
Question 9
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 10
Determine the s\tandard Gibbs free energy change (ΔG°) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K and 1 atm, given that ΔH° = -114.1 kJ/mol and ΔS° = 137.2 J/mol·K.
A. -114.1 kJ/mol
B. -114.1 kJ/mol + 137.2 J/mol·K
C. -114.1 kJ/mol - 137.2 J/mol·K
D. -114.1 kJ/mol + 137.2 kJ/mol·K
Question 11
A sample of a gas at 25°C and 1 atm has a volume of 2.50 L. What is the pressure of the gas at 50°C and 3.00 atm?
A. 3.00 atm
B. 4.00 atm
C. 5.00 atm
D. 6.00 atm
Question 12
A 10 g sample of a subs\tance is found to have a mass of 5 g after being placed in a beaker and heated to 100°C. Calculate the mass of water lost by the subs\tance.
A. 2 g
B. 5 g
C. 8 g
D. 10 g
Question 13
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 14
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 1000
B. 100
C. 10
D. 1
Question 15
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the concentration of the solution after mixing?
A. 0.1
B. 0.2
C. 0.3
D. 0.4

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