POST UTME REDEEMERS UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. If 1 mole of CO is formed at 25°C, what is the change in entropy (ΔS) of the system?
A. -34.5 J/K
B. -35.6 J/K
C. -36.7 J/K
D. -37.8 J/K
Question 2
The s\tandard enthalpy of formation of a compound is -200 kJ/mol. If 2 moles of the compound are formed, what is the total enthalpy change?
A. -400 kJ
B. -200 kJ
C. -100 kJ
D. 0 kJ
Question 3
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added to 20 mL of HCl, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 4
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 20.0 mL of NaOH has been added?
A. 8.00
B. 9.00
C. 10.00
D. 11.00
Question 5
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l). What is the type of reaction?
A. Synthesis reaction
B. Decomposition reaction
C. Single displacement reaction
D. Double displacement reaction
Question 6
A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 7
The diagram below shows a titration curve for the reaction between NaOH and HCl. What is the pH of the solution at point A?
A. 7.00
B. 8.00
C. 9.00
D. 10.00
Question 8
A gas is represented by the following equation:
A. Charles' Law
B. Gay-Lussac's Law
C. Avogadro's Law
D. Boyle's Law
Question 9
A solution contains 0.5 M H2SO4. What is the concentration of H+ ions in the solution?
A. 0.25 M
B. 0.5 M
C. 1 M
D. 2 M
Question 10
A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
B. 2
C. 3
D. 4
Question 11
A 10 g sample of a polymer is dissolved in 100 mL of a solvent. The solution has a vis\cosity of 0.5 Pa*s. What is the molar mass of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 12
A 0.500 M solution of HCl is mixed with a 0.250 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 13
A metal (M) reacts with oxygen to form a metal oxide (MO). If the s\tandard enthalpy of formation of MO is -200 kJ/mol and the s\tandard enthalpy of formation of M is -100 kJ/mol, what is the s\tandard enthalpy of formation of the reaction?
A. -100 kJ/mol
B. -150 kJ/mol
C. -200 kJ/mol
D. -250 kJ/mol
Question 14
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 9.00, what is the volume of NaOH added?
A. 10.0 mL
B. 15.0 mL
C. 20.0 mL
D. 25.0 mL
Question 15
A 0.500 M solution of NaOH is titrated with a 0.500 M solution of HCl. What is the pH of the solution after 25.0 mL of HCl has been added?
A. 8.00
B. 7.00
C. 6.00
D. 9.00

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