POST UTME CRAWFORD UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction of cyclohexane with bromine in the presence of light yields a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,2-dibromocyclohexane
Question 2
A polymer is formed by the condensation reaction between two monomers. If the molecular weight of the monomer is 180 g/mol and the molecular weight of the polymer is 3600 g/mol, what is the degree of polymerization?
A. 10
B. 20
C. 30
D. 40
Question 3
A 2.5 g sample of a metal (M) is dissolved in 50 cm³ of 2 M HCl. The resulting solution is then titrated with 1 M NaOH. If 25 cm³ of NaOH is required to reach the equivalence point, what is the molar mass of M?
A. \( M = \frac{2.5}{\frac{25}{1000} \times 1} \)
B. \( M = \frac{2.5}{\frac{25}{1000} \times 2} \)
C. \( M = \frac{2.5}{\frac{25}{1000} \times 1 \times 2} \)
D. \( M = \frac{2.5}{\frac{25}{1000} \times 2 \times 2} \)
Question 4
A 10.0 g sample of a subs\tance is dissolved in 100.0 mL of water. What is the molarity of the solution?
A. 0.100 M
B. 0.500 M
C. 1.00 M
D. 2.00 M
Question 5
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the equivalence point is reached at 35.0 mL of NaOH, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A sample of oxygen gas (O2) has a volume of 1.5 L at a pressure of 2 atm and a temperature of 300 K. What is the number of moles of oxygen gas?
A. 0.05 mol
B. 0.1 mol
C. 0.5 mol
D. 1 mol
Question 7
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 8
A 2.0 g sample of a gas is collected over water at 25°C and 1 atm. The volume of the gas is 2.5 L. What is the molar mass of the gas?
A. \( M = \frac{2.0 \times 1}{\frac{2.5}{22.4}} \)
B. \( M = \frac{2.0 \times 1}{\frac{2.5}{22.4} \times 273} \)
C. \( M = \frac{2.0 \times 1}{\frac{2.5}{22.4} \times 273 \times 1.33} \)
D. \( M = \frac{2.0 \times 1}{\frac{2.5}{22.4} \times 273 \times 1.33 \times 1} \)
Question 9
Determine the type of isomerism exhibited by the compound 2,3-dimethylbu\tane.
A. Structural isomerism
B. Stereoisomerism
C. Conformational isomerism
D. Tautomeric isomerism
Question 10
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To heat the solution
Question 11
A solution of sodium chloride (NaCl) is 0.2 M. What is the concentration of chloride ions \( Cl- \) in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 12
A gas at 25°C and 1 atm expands from 2.00 L to 4.00 L. What is the work done by the gas?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 13
A solution of NaOH is prepared by dissolving 25.0 g of NaOH in 500 mL of water. What is the molarity of the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 14
A 10 V battery is connected in series with a 5 Ω resistor and a 2 Ω resistor. What is the total resis\tance of the circuit?
A. \( R_{total} = 5 + 2 \)
B. \( R_{total} = 5 \times 2 \)
C. \( R_{total} = \frac{5 \times 2}{5 + 2} \)
D. \( R_{total} = \frac{5 + 2}{5 \times 2} \)
Question 15
A 50 mL sample of an aqueous solution containing 0.1 M H2SO4 is titrated with 0.2 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 10 mL
B. 15 mL
C. 20 mL
D. 25 mL

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