POST UTME NILE UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 7
C. 10
D. 14
Question 2
Determine the s\tandard cell potential for the reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s). Given that the s\tandard reduction potential for Cu2+/Cu is +0.34 V and for Zn2+/Zn is -0.76 V.
A. +1.10 V
B. +0.58 V
C. -0.42 V
D. -1.10 V
Question 3
A sample of sulfur dioxide gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the partial pressure of sulfur dioxide gas?
A. 0.98 atm
B. 0.99 atm
C. 1.00 atm
D. 1.01 atm
Question 4
A sample of a non-metallic oxide, X2O3, has a molar mass of 192 g/mol. If the oxide is composed of X and O atoms in a 2:3 ratio, determine the atomic mass of X.
A. 40 g/mol
B. 60 g/mol
C. 80 g/mol
D. 120 g/mol
Question 5
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 6
The half-life of a radioactive subs\tance is 5.00 years. If 100.0 g of the subs\tance is present initially, how much will remain after 10.0 years?
A. 50.0 g
B. 25.0 g
C. 12.5 g
D. 6.25 g
Question 7
What is the term for the process by which a molecule gains or loses electrons to form ions?
A. Ionization
B. Electron transfer
C. Protonation
D. Deprotonation
Question 8
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 20 mL of the acid is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 9
Determine the pH of a 0.1 M solution of HCN in water at 25°C, given that the dissociation cons\tant of HCN is 6.2 × 10^-10.
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 10
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 10.0 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 11
A 0.1 M solution of HCN is mixed with a 0.1 M solution of NaOH. What is the pH of the resulting solution?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 12
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is CaO(s) + CO2(g) → CaCO3(s).
A. -1782.6 kJ/mol
B. -1782.6 kJ/mol
C. -1782.6 kJ/mol
D. -1782.6 kJ/mol
Question 13
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To slow down the reaction
Question 14
The s\tandard reduction potential of the Cu2+/Cu couple is +0.34 V. What is the s\tandard reduction potential of the Ag+/Ag couple?
A. +0.80 V
B. +0.80 V
C. +0.80 V
D. +0.80 V
Question 15
What is the term for the process by which a solid changes directly to a gas?
A. Sublimation
B. Deposition
C. Evaporation
D. Condensation

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: