POST UTME BABCOCK UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Calculate the s\tandard enthalpy of formation of NH3(g) from the following data: ΔHf(NH3(g)) = ΔHf(H2(g)) + ΔHf(N2(g)) - ΔHf(NH3(g))
A. -46.1 kJ/mol
B. -92.2 kJ/mol
C. -46.1 kJ/mol
D. -92.2 kJ/mol
Question 2
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the s\tandard enthalpy of formation of N2(g) + 3H2(g) → 2NH3(g)?
A. -45.9 kJ/mol
B. -45.9 kJ/mol + 3\( 0 kJ/mol \)
C. -45.9 kJ/mol + 3\( 45.9 kJ/mol \)
D. -45.9 kJ/mol - 3\( 45.9 kJ/mol \)
Question 3
Identify the type of polymerization reaction that occurs in the following equation: CH2=CH-CH3 + CH2=CH-CH3 → [-CH2-CH2-CH2-CH2-]n.
A. Addition Polymerization
B. Condensation Polymerization
C. Ring-Opening Polymerization
D. Step-Growth Polymerization
Question 4
A redox reaction involves the transfer of electrons from one species to another. Which of the following is an example of a redox reaction?
A. Zn + CuSO4 → ZnSO4 + Cu
B. 2Al + Fe2O3 → Al2O3 + 2Fe
C. Ca + H2O → Ca(OH)2 + H2
D. Fe + O2 → Fe2O3
Question 5
A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of a polymer?
A. It has a high melting point
B. It has a low melting point
C. It is soluble in water
D. It is insoluble in water
Question 6
A 2.0 M solution of NaOH is to be diluted to a 0.5 M solution by adding water. If 250 mL of the 2.0 M solution is used, how many mL of water must be added?
A. 250 mL
B. 500 mL
C. 750 mL
D. 1000 mL
Question 7
The reaction between sodium hydroxide and acetic acid is a classic example of a reaction that is catalyzed by a strong acid. Which of the following is the correct equation for this reaction?
A. CH3COOH + NaOH → CH3COONa + H2O
B. CH3COOH + NaOH → CH3COONa + H2O + NaOH
C. CH3COOH + NaOH → CH3COONa + H2O + Na
D. CH3COOH + NaOH → CH3COONa + H2O + O2
Question 8
Calculate the s\tandard enthalpy of formation of CO2(g) from the following data: ΔHf(CO2(g)) = -393.5 kJ/mol, ΔHf(C(s)) = -394.4 kJ/mol, ΔHf(O2(g)) = 0 kJ/mol.
A. -393.5 kJ/mol
B. -394.4 kJ/mol
C. -393.5 kJ/mol + 394.4 kJ/mol
D. 0 kJ/mol
Question 9
A 1.0 M solution of H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 10
A polymer has a molecular weight of 50000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.1 g/L
C. 0.2 g/L
D. 0.5 g/L
Question 11
A biomolecule is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of a biomolecule?
A. It has a high melting point
B. It has a low melting point
C. It is soluble in water
D. It is insoluble in water
Question 12
The electronegativity of an element is a measure of its ability to attract electrons in a covalent bond. Which of the following elements has the highest electronegativity among the given options?
A. Fluorine (F)
B. Chlorine (Cl)
C. Bromine (Br)
D. Iodine (I)
Question 13
A 2.5 M solution of HCl is titrated with 1.0 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 14
The atomic structure of an atom consists of a nucleus surrounded by electrons. Which of the following is a characteristic of the nucleus?
A. It is positively charged
B. It is negatively charged
C. It is neutral
D. It is positively and negatively charged
Question 15
A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is an example of a polymer?
A. Polyethylene (PE)
B. Polypropylene (PP)
C. Polyvinyl Chloride (PVC)
D. Cellulose

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