POST UTME KSU 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The periodic table is a tabular arrangement of the known chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties. What is the term for the horizontal rows of the periodic table?
A. Periods
B. Groups
C. Blocks
D. Families
Question 2
A metal, M, reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of MCl2 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 3
The rate cons\tant of a first-order reaction is 0.05 min^\( -1 \). If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.01
B. 0.02
C. 0.03
D. 0.04
Question 4
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 5
A 0.1 M solution of a weak base, B, is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. What is the pKa of the base?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
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. -130.5 kJ/mol
C. -150.5 kJ/mol
D. -170.5 kJ/mol
Question 7
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 8
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
Question 9
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 10
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 11
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 12
A polymer, P, has a molecular weight of 100,000 g/mol. If 1 g of P is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 10 g/L
B. 20 g/L
C. 30 g/L
D. 40 g/L
Question 13
A 1.00 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in 1.00 L of water. What is the pH of the solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
A sample of nitrogen gas (N2) occupies a volume of 2.50 L at a pressure of 1.50 atm and a temperature of 298 K. What is the number of moles of nitrogen gas present?
A. 0.010 mol
B. 0.020 mol
C. 0.030 mol
D. 0.040 mol
Question 15
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. \( k = 0.005 , \text{M}^{-1} , \text{s}^{-1} \)

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