POST UTME MOUNTAIN TOP UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.00 M solution of NaOH is titrated with a 1.00 M solution of HCl. Calculate the pH of the solution after 25.0 mL of HCl has been added.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 2
A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 3
A sample of 2.0 g of a polymer is dissolved in 100 mL of a solvent. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
A 0.500 M solution of HCl is mixed with a 0.500 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 5
A sample of nitrogen gas (N2) at 25°C and 1 atm is heated to 100°C. If the volume of the gas increases by a factor of 2, what is the new pressure of the gas in atm?
A. 1 atm
B. 2 atm
C. 4 atm
D. 8 atm
Question 6
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the resulting concentration of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 7
A solution of 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution at the equivalence point?
A. 7
B. 10
C. 14
D. 12
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) if the s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol and that of CO2(g) is -393.5 kJ/mol.
A. -1782.59 kJ/mol
B. -1782.59 kJ/mol
C. -1782.59 kJ/mol
D. -1782.59 kJ/mol
Question 9
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is added, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 10
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 10.0 mL of NaOH has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 11
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 12
A gas at 25°C and 1 atm has a volume of 2.5 L. What is the volume of the gas at 50°C and 2 atm?
A. 5 L
B. 6 L
C. 7 L
D. 8 L
Question 13
A metal M has an atomic radius of 135 pm and a first ionization energy of 520 kJ/mol. The metal is a member of the alkali metal group. What is the identity of the metal?
A. Li
B. Na
C. K
D. Rb
Question 14
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is added, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 15
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6(s).
A. -2800 kJ
B. -2900 kJ
C. -3000 kJ
D. -3100 kJ

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