POST UTME WELLSPRING UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The half-life of a radioactive subs\tance is 5.0 years. If 100 g of the subs\tance is present initially, how much will remain after 10 years?
A. 25 g
B. 25 g
C. 25 g
D. 25 g
Question 2
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 1-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
C. 1-chloro-2-methylbu\tane
D. 2-chloro-2-methylbu\tane
Question 3
A polymer has a molecular weight of 100,000 g/mol. What is the number of monomer units in the polymer?
A. 100
B. 1000
C. 10,000
D. 100,000
Question 4
A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 2.0 L at cons\tant temperature. What is the new pressure of the gas?
A. 2 atm
B. 4 atm
C. 6 atm
D. 8 atm
Question 5
The s\tandard electrode potential of the cell is given by E^\circ = E^\circ_{cathode} - E^\circ_{anode}. If the s\tandard electrode potential of the cathode is 0.5 V and the s\tandard electrode potential of the anode is -0.2 V, what is the s\tandard electrode potential of the cell?
A. 0.7 V
B. 0.7 V
C. 0.7 V
D. 0.7 V
Question 6
A 0.1 M solution of a weak base B(OH)3 is mixed with 0.1 M solution of a strong acid HCl. If the initial concentration of B(OH)3 is 0.1 M, what is the concentration of B(OH)3 after the reaction is complete?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 7
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.5 atm
B. 2.5 atm
C. 3.5 atm
D. 4.5 atm
Question 8
The atomic radius of an element is given by the equation r = r_0 \cdot \( Z^{2/3} \) where r_0 = 0.53 \cdot 10^{-10} m and Z is the atomic number. If the atomic number of an element is 12, what is the atomic radius of the element?
A. 1.43 \cdot 10^{-10} m
B. 1.43 \cdot 10^{-10} m
C. 1.43 \cdot 10^{-10} m
D. 1.43 \cdot 10^{-10} m
Question 9
Determine the s\tandard enthalpy of formation of the compound C2H5OH(l) from the s\tandard enthalpies of formation of its constituent elements.
A. -277.7 kJ/mol
B. -285.7 kJ/mol
C. -297.7 kJ/mol
D. -307.7 kJ/mol
Question 10
A 2.0 g sample of a mixture of NaCl and KCl is dissolved in 100 mL of water. The resulting solution is then titrated with 0.1 M AgNO3. If 25 mL of AgNO3 is required to reach the equivalence point, what is the mass of KCl in the sample?
A. 0.5 g
B. 1.0 g
C. 1.5 g
D. 2.0 g
Question 11
A 2.0 M solution of H_(2)SO_(4) is mixed with a 2.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 1.00
C. 1.00
D. 1.00
Question 12
The diagram below shows a chemical apparatus setup. What is the purpose of the condenser?
A. To cool the reaction mixture
B. To heat the reaction mixture
C. To mix the reac\tants
D. To measure the pH of the solution
Question 13
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C6H12O6(s) to form CO2(g) and H2O(l).
A. -2803.5 kJ/mol
B. -2803.5 kJ/mol
C. -2803.5 kJ/mol
D. -2803.5 kJ/mol
Question 14
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 15
A 1.0 M solution of H_(2)SO_(4) is mixed with a 1.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 1.00
C. 1.00
D. 1.00

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