POST UTME COAL CITY UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of sodium hydroxide (NaOH) is mixed with a 0.2 M solution of hydrochloric acid (HCl). If the reaction is allowed to proceed to completion, calculate the concentration of the resulting solution.
A. 0.05 M
B. 0.15 M
C. 0.25 M
D. 0.35 M
Question 2
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.
A. 100
B. 200
C. 300
D. 400
Question 3
A solution of a weak base (BOH) is 0.1 M. If 10 mL of this solution is titrated with 0.1 M HCl, what is the pH of the resulting solution?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 4
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the reaction is complete?
A. 7
B. 7.5
C. 8
D. 9
Question 5
In a study on the environmental impact of industrial activities, a researcher measured the concentration of heavy metals in soil samples. The data showed a significant increase in metal concentrations near industrial sites. Which of the following is a likely consequence of this finding?
A. Increased risk of cancer in humans
B. Decreased fertility in plants
C. Accelerated soil erosion
D. Enhanced soil nutrient cycling
Question 6
A 0.5 M solution of potassium chloride (KCl) is electrolyzed u\sing a platinum electrode. If the cell potential is 2.5 V, calculate the number of moles of chlorine gas evolved at the anode.
A. 0.08 mol
B. 0.16 mol
C. 0.24 mol
D. 0.32 mol
Question 7
A 1.00 g sample of a metal hydroxide is heated to produce a 0.75 g sample of the metal oxide. What is the molar mass of the metal hydroxide?
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 8
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 20 mL of the acid solution is titrated with 25 mL of the base solution, what is the pH of the resulting solution?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 9
A 250 mL sample of a 0.50 M solution of NaOH is mixed with a 250 mL sample of a 0.50 M solution of HCl. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in 100 mL of water. What is the molarity of the solution?
A. 0.625 M
B. 0.75 M
C. 1.25 M
D. 1.5 M
Question 11
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CH4(g) u\sing the following reaction: C(s) + 2H2(g) → CH4(g).
A. -74.8 kJ/mol
B. -74.8 kJ/mol
C. -74.8 kJ/mol
D. -74.8 kJ/mol
Question 12
A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. If the concentration of the solution is 0.5 g/mL, calculate the molar mass of the polymer.
A. 500 g/mol
B. 1000 g/mol
C. 1500 g/mol
D. 2000 g/mol
Question 13
The reaction of 2,2-dimethylpropane with chlorine produces a mixture of 2,2-dimethyl-1-chloropropane and 2,2-dimethyl-2-chloropropane. What is the major product of this reaction?
A. 2,2-dimethyl-1-chloropropane
B. 2,2-dimethyl-2-chloropropane
C. cis-2,2-dimethyl-1-chloropropane
D. trans-2,2-dimethyl-1-chloropropane
Question 14
A sample of a metal hydroxide is dissolved in water to form a solution. The concentration of the solution is 0.1 M. If 20 mL of this solution is titrated with 0.1 M HCl, what is the pH of the resulting solution?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 15
Determine the molar mass of a compound that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.
A. 60 g/mol
B. 80 g/mol
C. 100 g/mol
D. 120 g/mol

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