POST UTME AL-HIKMAH UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The s\tandard electrode potential of the cell: Zn(s) | Zn2+(aq) | Cu2+(aq) | Cu(s) is 1.10 V. What is the s\tandard cell potential of the cell: Cu2+(aq) | Cu(s) | Zn2+(aq) | Zn(s)?
A. -1.10 V
B. -1.10 V
C. -1.10 V
D. 1.10 V
Question 2
The rate cons\tant of a first-order reaction is given by the equation: k = 2.303/t \log[A]0/[A]t. If the half-life of the reaction is 20 minutes, what is the value of k?
A. 0.035 min^-1
B. 0.035 s^-1
C. 0.035 h^-1
D. 0.035 min^-1
Question 3
The diagram below shows a graph of the variation of the boiling point of a subs\tance with temperature. What is the type of variation represented by this graph?
A. Direct variation
B. Inverse variation
C. Proportional variation
D. Inverse square variation
Question 4
The half-reaction for the reduction of Cu2+ to Cu is: Cu2+ + e- → Cu+ + H+.
A. Cu2+ + 2e- → Cu
B. Cu2+ + e- → Cu+ + H+
C. Cu2+ + 2e- → 2Cu
D. Cu2+ + e- → Cu
Question 5
A 1.0 M solution of H2SO4(aq) is mixed with a 2.0 M solution of NaOH(aq). What is the concentration of the resulting solution?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 6
A sample of oxygen gas (O2) is collected over water at a temperature of 25°C and a pressure of 1 atm. The volume of the gas is 3.5 L. Calculate the partial pressure of the oxygen gas.
A. 1.0 atm
B. 1.5 atm
C. 2.0 atm
D. 2.5 atm
Question 7
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 C(s) to form CO2(g).
A. 393.5 kJ/mol
B. -393.5 kJ/mol
C. 0 kJ/mol
D. -1 kJ/mol
Question 8
A solution contains 0.1 M NaCl. If 10 mL of this solution is diluted to 100 mL, what is the concentration of the resulting solution?
A. 0.01 M
B. 0.1 M
C. 0.01 M
D. 0.001 M
Question 9
A 0.1 M solution of 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 10
A solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in 100 mL of water. The resulting solution has a density of 1.03 g/mL. Calculate the molarity of the solution.
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 11
A 2.0 g sample of a compound containing only C, H, and O is analyzed by combustion. The amount of CO2 produced is 1.2 g, and the amount of H2O produced is 0.8 g. What is the empirical formula of the compound?
A. C2H4O
B. C2H4O2
C. C3H6O
D. C3H6O2
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 13
A 2.50 g sample of an unknown hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. Calculate the molar mass of the hydrocarbon.
A. 12.0
B. 20.0
C. 30.0
D. 40.0
Question 14
The polymer polyethylene is made up of repeating units of ethylene monomers. What is the chemical formula for the repeating unit?
A. C2H4
B. C2H6
C. C3H6
D. C3H8
Question 15
Calculate the s\tandard enthalpy of formation of CO2(g) from the following reaction: C(s) + O2(g) → CO2(g). The s\tandard enthalpies of formation of C(s) and O2(g) are -393.5 kJ/mol and 0 kJ/mol, respectively.
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 0 kJ/mol
C. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol
D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol + 0 kJ/mol

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