POST UTME NOUN 2021 Chemistry | Objective

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Question 1
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the initial volume of the HCl solution in liters?
A. 100 mL
B. 200 mL
C. 300 mL
D. 400 mL
Question 2
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50.0 mL of the HCl solution is added to 100.0 mL of the NaOH solution, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 3
A metal (X) reacts with oxygen to form a basic oxide (Y). The basic oxide (Y) is used in the manufacture of glass. Identify the metal (X) and the basic oxide (Y).
A. Magnesium, Magnesium Oxide
B. Calcium, Calcium Oxide
C. Sodium, Sodium Oxide
D. Potassium, Potassium Oxide
Question 4
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To inhibit the reaction
Question 5
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?
A. 80,000 g/mol
B. 90,000 g/mol
C. 100,000 g/mol
D. 110,000 g/mol
Question 6
A 0.5 M solution of CuSO4 is electrolyzed u\sing a platinum electrode. If the cell potential is 1.0 V, what is the mass of Cu produced at the cathode in 1 hour?
A. 0.1 g
B. 0.2 g
C. 0.3 g
D. 0.4 g
Question 7
A solution contains 0.1 M HCl and 0.1 M NaOH. A 10 mL sample of the solution is titrated with 0.1 M NaOH. Calculate the pH of the solution after the titration.
A. 1
B. 2
C. 7
D. 14
Question 8
A solution contains 0.10 M NaCl. What is the concentration of Cl- ions in the solution?
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 9
A 0.1 M solution of FeSO4 is electrolyzed u\sing a platinum electrode. If the cell potential is 1.5 V, what is the mass of Fe produced at the cathode in 1 hour?
A. 0.1 g
B. 0.2 g
C. 0.3 g
D. 0.4 g
Question 10
A metal (X) reacts with dilute hydrochloric acid to produce a gas (Y). The gas (Y) is used in the manufacture of semiconductors. Identify the metal (X) and the gas (Y).
A. Zinc, Hydrogen
B. Iron, Oxygen
C. Copper, Nitrogen
D. Lead, Carbon Dioxide
Question 11
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the initial volume of the NaOH solution in liters?
A. 100 mL
B. 200 mL
C. 300 mL
D. 400 mL
Question 12
Determine the type of hybridization exhibited by the central atom in the molecule CH2Cl2.
A. sp3
B. sp2
C. sp
D. dsp3
Question 13
Calculate the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 14
Determine the number of moles of ΔH2O produced when 2.5 g of H2SO4 reacts with 3.0 g of NaOH in a reaction where the molar mass of H2SO4 is 98.08 g/mol and the molar mass of NaOH is 40.00 g/mol.
A. 0.025 mol
B. 0.050 mol
C. 0.075 mol
D. 0.100 mol
Question 15
Determine the s\tandard enthalpy of formation of NO2(g) from the following data: ΔH°f(N2(g)) = 0 kJ/mol, ΔH°f(O2(g)) = 0 kJ/mol, ΔH°f(NO(g)) = 90.29 kJ/mol. The reaction is: N2(g) + 2O2(g) → 2NO2(g).
A. -99.41 kJ/mol
B. -90.29 kJ/mol
C. -80.29 kJ/mol
D. -70.29 kJ/mol

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