POST UTME CHRISTOPHER UNIVERSITY 2017 Chemistry | Objective

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Question 1
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the number of moles of H2SO4.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 2
A polymer is formed by the condensation reaction between two monomers, A and B. If the molecular weight of the polymer is 100,000 g/mol and the molecular weight of monomer A is 50,000 g/mol, what is the molecular weight of monomer B?
A. 25,000 g/mol
B. 50,000 g/mol
C. 75,000 g/mol
D. 100,000 g/mol
Question 3
The s\tandard enthalpy of formation \( ΔH_f^∘ \) for CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation for C(s) + O2(g) → CO2(g)?
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 0 kJ/mol
C. -393.5 kJ/mol - 0 kJ/mol
D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol
Question 4
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. -120.5 kJ/mol
C. -130.5 kJ/mol
D. -140.5 kJ/mol
Question 5
A diagram of a titration setup is shown below. If 25.0 mL of 1.00 M NaOH is added to 50.0 mL of 2.50 M HCl, what is the pH of the solution?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 6
A solution of NaOH is prepared by dissolving 25.0 g of NaOH in 250 mL of water. What is the molarity of the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 7
A sample of a hydrocarbon with the molecular formula C5H12 is found to have a density of 0.65 g/mL. What is the molar mass of the hydrocarbon?
A. 70 g/mol
B. 80 g/mol
C. 90 g/mol
D. 100 g/mol
Question 8
The s\tandard enthalpy of formation \( ΔH_f^∘ \) for CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation for C(s) + O2(g) → CO2(g)?
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 0 kJ/mol
C. -393.5 kJ/mol - 0 kJ/mol
D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol
Question 9
A polymer is made up of repeating units of the following structure: CH2=CH—CH2—CH3. What is the type of polymerization reaction that occurred to form this polymer?
A. Condensation polymerization
B. Addition polymerization
C. Ring-opening polymerization
D. Step-growth polymerization
Question 10
A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1.0 L of water. What is the concentration of H+ ions in the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 11
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. What is the oxidation number of Mn in MnO4-?
A. +7
B. +6
C. +5
D. +4
Question 12
A 0.5 M solution of HCl is prepared by dissolving 20.0 g of HCl in 250 mL of water. What is the concentration of HCl in g/L?
A. 0.6 g/L
B. 0.8 g/L
C. 1.0 g/L
D. 1.2 g/L
Question 13
A metal oxide has the formula M2O3. If the molar mass of the metal is 50 g/mol and the molar mass of oxygen is 16 g/mol, what is the molar mass of the metal oxide?
A. 200 g/mol
B. 220 g/mol
C. 240 g/mol
D. 260 g/mol
Question 14
A 2.0 M solution of HCl is prepared by dissolving 40.0 g of HCl in 250 mL of water. What is the concentration of HCl in g/L?
A. 1.2 g/L
B. 1.6 g/L
C. 2.0 g/L
D. 2.4 g/L
Question 15
A 2.50 M solution of HCl is titrated with 1.00 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 2.00
B. 3.00
C. 4.00
D. 5.00

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