POST UTME EKSU 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 L sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the resulting solution?
A. 7
B. 7.5
C. 8
D. 9
Question 2
A 2.5 g sample of a polymer is dissolved in 100 mL of a solvent. The osmotic pressure of the solution is 2.5 atm at 25°C. Calculate the molar mass of the polymer.
A. 1000 g/mol
B. 2000 g/mol
C. 3000 g/mol
D. 4000 g/mol
Question 3
A 1.0 L sample of a solution containing 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 4
The balanced equation for the reaction between sodium hydroxide and hydrochloric acid is:
A. 2NaOH + HCl \rightarrow NaCl + H2O
B. 2NaOH + HCl \rightarrow Na2Cl + H2O
C. 2NaOH + HCl \rightarrow NaCl + NaOH
D. 2NaOH + HCl \rightarrow Na2Cl + NaOH
Question 5
A 10 g sample of a subs\tance is burned in a bomb calorimeter. The temperature of the calorimeter increases by 10°C. Calculate the heat of combustion of the subs\tance.
A. -1000 kJ/mol
B. -2000 kJ/mol
C. -3000 kJ/mol
D. -4000 kJ/mol
Question 6
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If the gas is heated to 100°C at cons\tant volume, what is the new pressure?
A. 1.5 atm
B. 2.5 atm
C. 3.5 atm
D. 4.5 atm
Question 7
A solution contains 0.5 M NaCl and 0.2 M CaCl2. Calculate the total concentration of Cl- ions in the solution.
A. 0.7 M
B. 0.6 M
C. 0.5 M
D. 0.4 M
Question 8
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 25°C. Calculate the volume of the gas at a pressure of 3.0 atm and a temperature of 50°C.
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 9
The half-life of a radioactive subs\tance is 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?
A. 250 Bq
B. 500 Bq
C. 750 Bq
D. 1000 Bq
Question 10
A 1.00 M solution of HCl is mixed with a 1.00 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 11
The reaction of sodium with water is represented by the equation: \( 2Na + 2H_2O \rightarrow 2NaOH + H_2 \). What is the oxidation state of sodium in the product NaOH?
A. +1
B. +2
C. +3
D. +4
Question 12
Determine the molar mass of a polymer with the repeating unit [C6H5C6H4]n. Given that the molar mass of the repeating unit is 122.15 g/mol, calculate the molar mass of the polymer.
A. 122.15 g/mol
B. 244.3 g/mol
C. 366.45 g/mol
D. 488.6 g/mol
Question 13
The rate cons\tant (k) of a reaction is related to the activation energy (Ea) by the equation:
A. \ln k = \ln A - \frac{Ea}{RT}
B. \ln k = \ln A + \frac{Ea}{RT}
C. \ln k = \ln A - \frac{RT}{Ea}
D. \ln k = \ln A + \frac{RT}{Ea}
Question 14
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C2H6(l) at 298 K.
A. -1570.8 kJ/mol
B. -1470.8 kJ/mol
C. -1370.8 kJ/mol
D. -1670.8 kJ/mol
Question 15
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 + 0 kJ/mol
D. -394.4 kJ/mol + 0 kJ/mol

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