POST UTME UNILORIN 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of solvent, what is the concentration?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 2
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the molarity of the resulting solution?
A. 1.0 M
B. 1.1 M
C. 1.2 M
D. 1.3 M
Question 3
A solution of sodium hydroxide (NaOH) has a concentration of 0.5 M. If 25 mL of this solution is diluted to 100 mL, what is the new concentration?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
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 addition of 15.0 mL of NaOH?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 5
The reaction of nitrogen with oxygen to form nitrogen dioxide is represented by the equation: 4NO + O2 → 2NO2. If 2.5 moles of NO react with 1 mole of O2, calculate the limiting reac\tant and the amount of NO2 produced.
A. 1 mole of NO2
B. 2 moles of NO2
C. 3 moles of NO2
D. 4 moles of NO2
Question 6
A 0.5 M solution of NaOH is prepared by dissolving 10 g of NaOH in 1 L of water. Calculate the pH of the solution.
A. 10
B. 11
C. 12
D. 13
Question 7
A sample of glu\cose (C6H12O6) has a mass of 10 g. Calculate the number of moles of glu\cose present.
A. 0.1 mol
B. 0.2 mol
C. 0.3 mol
D. 0.4 mol
Question 8
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 9
A reaction is represented by the equation: A + B → C + D. If the rate cons\tant (k) is 0.5 min^-1, what is the rate of reaction after 10 minutes?
A. 0.25
B. 0.5
C. 1
D. 2
Question 10
A polymer has a degree of polymerization (n) of 500. If the molecular weight of the monomer is 100 g/mol, what is the molecular weight of the polymer?
A. 50000 g/mol
B. 50000.1 g/mol
C. 50000.2 g/mol
D. 50000.3 g/mol
Question 11
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 12
A solution of sulfuric acid is electrolyzed u\sing a platinum electrode. What is the product at the anode?
A. \( 2H_2O \rightarrow O_2 + 4H^+ + 4e^- \)
B. \( 2H_2O \rightarrow 2H_2 + O_2 \)
C. \( 2H_2O \rightarrow 2H_2 + 2OH^- \)
D. \( 2H_2O \rightarrow 2H_2O + 2H^+ \)
Question 13
Determine the structure of the compound with molecular formula C5H12O.
A. \( CH_3CH_2CH_2CH_2CH_3 \)
B. \( CH_3CH_2CH_2CH_2OH \)
C. \( CH_3CH_2CH_2CH_2CH_2OH \)
D. \( CH_3CH_2CH_2CH_2CH_2CH_3 \)
Question 14
The reaction of nitrogen with oxygen produces nitrogen dioxide. What is the balanced chemical equation for this reaction?
A. N2 + O2 → 2NO
B. N2 + O2 → 2NO2
C. 2N2 + O2 → 2N2O
D. 2N2 + O2 → N2O2
Question 15
A 1.0 M solution of CaCl2 is mixed with a 1.0 M solution of Na2CO3. What is the molarity of the resulting solution?
A. 1.0 M
B. 1.1 M
C. 1.2 M
D. 1.3 M

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