POST UTME IGBINEDION UNIVERSITY 2022 Chemistry | Objective

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Question 1
A solution of HCl is titrated with a solution of NaOH. The initial pH of the solution is 2. If 25 mL of NaOH is added, the pH increases to 3. What is the concentration of HCl in the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
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)?
A. 45.9 kJ/mol
B. -45.9 kJ/mol
C. 0 kJ/mol
D. 90.9 kJ/mol
Question 3
A 2.50 g sample of a polymer is dissolved in 100 mL of a solvent. If the solution has a density of 1.25 g/mL, what is the concentration of the polymer in g/L?
A. 0.050 g/L
B. 0.100 g/L
C. 0.150 g/L
D. 0.200 g/L
Question 4
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.00250 mol
B. 0.00275 mol
C. 0.00300 mol
D. 0.00325 mol
Question 5
A 1.0 L solution of 0.1 M NaCl is electrolyzed u\sing a current of 1.0 A for 2.0 hours. What is the mass of Cl2 produced?
A. 0.5 g
B. 1.0 g
C. 2.0 g
D. 4.0 g
Question 6
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. If 25.0 mL of each solution is mixed, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 7
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 50.0 mL of NaOH has been added.
A. 1.00
B. 1.50
C. 2.00
D. 2.50
Question 8
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. The half-reactions are: Fe2+ → Fe3+ + e- and MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. What is the overall reaction?
A. Fe2+ + MnO4- → Fe3+ + Mn2+
B. Fe2+ + MnO4- → Fe3+ + MnO2
C. Fe2+ + MnO4- → Fe + Mn2+
D. Fe2+ + MnO4- → Fe3+ + MnO2
Question 9
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C at cons\tant pressure, what is the new volume of the gas?
A. 3.125 L
B. 2.5 L
C. 5 L
D. 6.25 L
Question 10
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of CO2(g)?
A. -393.5 kJ/mol
B. -110.5 kJ/mol
C. 110.5 kJ/mol
D. 393.5 kJ/mol
Question 11
The s\tandard enthalpy of formation of O2(g) is 0 kJ/mol. What is the s\tandard enthalpy of formation of H2O(g)?
A. -285.8 kJ/mol
B. 285.8 kJ/mol
C. 0 kJ/mol
D. 57.8 kJ/mol
Question 12
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 13
A 2.00 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. 46.05 g/mol
B. 46.07 g/mol
C. 46.10 g/mol
D. 46.15 g/mol
Question 14
At 273 K, a sample of an ideal gas occupies a volume of 2.5 L. If the pressure is increased to 5 atm, what is the new volume of the gas, assuming the temperature remains cons\tant?
A. 1.25 L
B. 2.5 L
C. 5 L
D. 10 L
Question 15
The s\tandard enthalpy of formation of O2(g) is 0 kJ/mol. What is the s\tandard enthalpy of formation of H2O(g)?
A. -285.8 kJ/mol
B. 285.8 kJ/mol
C. 0 kJ/mol
D. 57.8 kJ/mol

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