POST UTME KSU 2024 Chemistry | Objective

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Question 1
A solution contains 2.5 g of NaCl in 50 mL of water. Calculate the molality of the solution.
A. 0.085 m
B. 0.0855 m
C. 0.086 m
D. 0.0865 m
Question 2
Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) is decomposed according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 0.050 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 3
A 2.00 M solution of sodium hydroxide (NaOH) is prepared by dissolving 40.0 g of NaOH in 1.00 L of water. What is the pH of the solution?
A. 12.0
B. 13.0
C. 14.0
D. 15.0
Question 4
A solution contains 2.5 g of NaCl in 50 mL of water. Calculate the molarity of the solution.
A. 0.085 M
B. 0.0855 M
C. 0.086 M
D. 0.0865 M
Question 5
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. -130.5 kJ/mol
C. -150.5 kJ/mol
D. -170.5 kJ/mol
Question 6
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 7
A solution contains 2.5 g of NaCl in 50 mL of water. Calculate the molarity of the solution.
A. 0.085 M
B. 0.0855 M
C. 0.086 M
D. 0.0865 M
Question 8
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the pKa of the acid?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 9
A metal, M, reacts with oxygen to form a white solid. The reaction is as follows: 4M + 3O2 → 2M2O3. If 2.5 g of M2O3 is obtained from 1.5 g of M, what is the molar mass of M?
A. 20 g/mol
B. 40 g/mol
C. 60 g/mol
D. 80 g/mol
Question 10
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.1 M and 0.05 M, respectively, and the rate of reaction is 0.02 M/s after 10 minutes.
A. \( k = 0.05 , \text{M}^{-1} , \text{s}^{-1} \)
B. \( k = 0.02 , \text{M}^{-1} , \text{s}^{-1} \)
C. \( k = 0.01 , \text{M}^{-1} , \text{s}^{-1} \)
D. \( k = 0.005 , \text{M}^{-1} , \text{s}^{-1} \)
Question 11
A sample of a polymer has a molecular weight of 50000 g/mol. Calculate the number of monomer units in the polymer.
A. 1000
B. 10000
C. 50000
D. 100000
Question 12
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 13
A sample of a polymer has a molecular weight of 50000 g/mol. Calculate the number of monomer units in the polymer.
A. 1000
B. 10000
C. 50000
D. 100000
Question 14
A diagram of a titration setup is shown below. What is the concentration of the NaOH solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 15
The non-metals are a group of elements that are located in the upper right corner of the periodic table. What is the term for the process by which a non-metal gains electrons to form a negatively charged ion?
A. Ionization
B. Electron gain
C. Proton loss
D. Neutron capture

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