POST UTME CALEB UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the product Cu(s)?
A. 0
B. +1
C. +2
D. -1
Question 2
A mixture of 2.0 g of C6H12O6 and 1.0 g of C2H5OH is heated to produce a product. What is the limiting reac\tant?
A. C6H12O6
B. C2H5OH
C. Both are limiting reac\tants
D. Neither is a limiting reac\tant
Question 3
A solution containing 0.500 M NaCl is prepared by dissolving 25.0 g of NaCl in 1.00 L of water. What is the concentration of Cl^- ions in the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 4
The half-reaction for the reduction of Cr2O72- is: Cr2O72- + 14H+ + 6e- → 2Cr3+ + 7H2O. What is the s\tandard reduction potential of Cr2O72-?
A. +1.33 V
B. +1.33 V
C. +1.33 V
D. +1.33 V
Question 5
A 2.50 M solution of HCl is mixed with a 1.50 M solution of NaOH. What is the concentration of the resulting solution?
A. 1.00 M
B. 1.00 M
C. 1.00 M
D. 1.00 M
Question 6
A solution contains 0.1 M NaCl and 0.1 M Na2SO4. What is the concentration of Cl^- ions in the solution?
A. 0.1 M
B. 0.15 M
C. 0.2 M
D. 0.25 M
Question 7
A sample of nitrogen gas is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 0.0313 atm, what is the mole \fraction of nitrogen gas?
A. 0.969
B. 0.971
C. 0.973
D. 0.975
Question 8
A 2.00 M solution of HNO3 is mixed with a 1.00 M solution of NaOH. What is the concentration of the resulting solution?
A. 1.00 M
B. 1.00 M
C. 1.00 M
D. 1.00 M
Question 9
A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 0.977 atm
B. 0.983 atm
C. 0.989 atm
D. 0.995 atm
Question 10
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. Calculate the s\tandard enthalpy of formation of NH4Cl(s) u\sing the following reaction: NH3(g) + HCl(g) → NH4Cl(s).
A. -365.5 kJ/mol
B. -365.5 kJ/mol
C. -365.5 kJ/mol
D. -365.5 kJ/mol
Question 11
A metal M has a density of 8.9 g/cm^3 and a molar mass of 65.4 g/mol. What is the atomic radius of M?
A. 1.35 Å
B. 1.36 Å
C. 1.37 Å
D. 1.38 Å
Question 12
A 2.00 L sample of 0.100 M H2SO4 is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.0020
B. 0.0040
C. 0.0060
D. 0.0080
Question 13
The half-reaction for the reduction of MnO4- is: MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. What is the s\tandard reduction potential of MnO4-?
A. +1.51 V
B. +1.51 V
C. +1.51 V
D. +1.51 V
Question 14
A 0.100 M solution of NaCl is prepared by dissolving 10.0 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.050 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 15
A 2.00 g sample of a polymer is dissolved in 100 mL of solvent. If the polymer has a molecular weight of 100,000 g/mol, what is the concentration of the polymer solution?
A. 0.02 g/mL
B. 0.05 g/mL
C. 0.10 g/mL
D. 0.20 g/mL

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