POST UTME BABCOCK UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the initial pH of the solution is 4.5, what is the pH after the addition of 20 mL of 0.1 M NaOH?
A. 5.5
B. 6.5
C. 7.5
D. 8.5
Question 2
A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 atm
B. 2.02 atm
C. 0.5 atm
D. 1.01 atm
Question 3
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 4
A 1.0 M solution of H2SO4 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 5
A colloid is a mixture in which the particles are dispersed in a continuous phase. Which of the following is an example of a colloid?
A. Milk
B. Honey
C. Blood
D. Water
Question 6
The reaction between hydrogen gas and oxygen gas is a classic example of a reaction that is catalyzed by a catalyst. Which of the following is the correct equation for this reaction?
A. 2H2 + O2 → 2H2O
B. 2H2 + O2 → 2H2O + H2O
C. 2H2 + O2 → 2H2O + O2
D. 2H2 + O2 → 2H2O + H2
Question 7
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 100 g/mol
B. 200 g/mol
C. 50 g/mol
D. 25 g/mol
Question 8
A 2.0 M solution of HCl is titrated with 0.5 M NaOH. What is the pH of the solution after 30 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 9
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 10
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 11
The reaction between hydrogen gas and oxygen gas is a classic example of a reaction that is catalyzed by a catalyst. Which of the following is the correct equation for this reaction?
A. 2H2 + O2 → 2H2O
B. 2H2 + O2 → 2H2O + H2O
C. 2H2 + O2 → 2H2O + O2
D. 2H2 + O2 → 2H2O + H2
Question 12
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 13
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 14
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 15
A sample of a non-metallic element is placed in a beaker and heated in a Bunsen burner flame. The resulting compound is a white solid. What is the likely identity of the non-metallic element?
A. Sulfur (S)
B. Phosphorus (P)
C. Carbon (C)
D. Silicon (Si)

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