POST UTME IMS U 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a hydrocarbon has a molecular formula of C_5H_{12}. What is the type of hydrocarbon?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon
Question 2
A solution contains 0.1 M Cu^2+ ions. If 10 mL of this solution is added to 90 mL of 0.1 M NaOH, what is the concentration of Cu^2+ ions in the resulting solution?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 3
A 0.1 M solution of NaOH is prepared by dissolving 2.5 g of NaOH in 100 mL of water. What is the concentration of OH- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M
Question 4
A 2.50 g sample of a compound containing only carbon and hydrogen is found to have an empirical formula of CH2O. Calculate the molar mass of the compound.
A. 46.06 g/mol
B. 62.06 g/mol
C. 74.06 g/mol
D. 86.06 g/mol
Question 5
A reaction is represented by the equation: A + B → C + D. If 1 mole of A and 1 mole of B are present initially, and 1 mole of C is produced after 10 minutes, what is the rate of reaction?
A. 0.5 mol/min
B. 1 mol/min
C. 2 mol/min
D. 5 mol/min
Question 6
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M
Question 7
A reaction is represented by the equation: 2A + B → 2C + D. If 2.0 mol of A and 1.0 mol of B are present initially, and 1.0 mol of C is formed after 10 minutes, calculate the rate cons\tant (k) for the reaction.
A. 0.05 min^-1
B. 0.10 min^-1
C. 0.20 min^-1
D. 0.30 min^-1
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1.0 mole of CO(g)?
A. -393.5 kJ
B. -393.5 kJ + 283.0 kJ
C. -393.5 kJ - 283.0 kJ
D. -393.5 kJ + 283.0 kJ + 283.0 kJ
Question 9
A solution contains 5.0 g of glu\cose (C6H12O6) dissolved in 50.0 mL of water. Calculate the concentration of the solution in g/L.
A. 0.10 g/L
B. 1.00 g/L
C. 10.0 g/L
D. 100 g/L
Question 10
A solution contains 0.1 M Cu^2+ ions. If 10 mL of this solution is added to 90 mL of 0.1 M NaOH, what is the concentration of Cu^2+ ions in the resulting solution?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 11
A redox reaction involves the oxidation of Fe^2+ to Fe^3+ and the reduction of MnO_4^- to Mn^2+. What is the type of redox reaction?
A. Oxidation-reduction reaction
B. Combustion reaction
C. Neutralization reaction
D. Acid-base reaction
Question 12
A 1 M solution of a strong acid HA is titrated with 1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 7.0
B. 6.0
C. 5.0
D. 4.0
Question 13
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. 0.005 M
B. 0.05 M
C. 0.1 M
D. 0.5 M
Question 14
A system has an entropy change of 10 J/K. If the temperature change is 20 K, what is the heat transfer?
A. 200 J
B. 400 J
C. 600 J
D. 800 J
Question 15
A 0.1 M solution of a weak base B has a pH of 10.5. If 10 mL of 1 M HCl is added to 20 mL of the base solution, what is the pH of the resulting solution?
A. 9.5
B. 9.0
C. 8.0
D. 7.0

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