POST UTME CHRISTOPHER UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A polymer has a molecular weight of 100,000 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 1.00 g/L
B. 2.00 g/L
C. 3.00 g/L
D. 4.00 g/L
Question 2
A 1.5 M solution of HCl is mixed with a 1.5 M solution of NaOH. What is the resulting concentration of NaCl?
A. 0.5
B. 1
C. 1.5
D. 2
Question 3
The boiling point of a solution containing 10.0 g of glu\cose (C6H12O6) in 100.0 g of water is 100.5°C. What is the molality of the solution?
A. 0.50 m
B. 0.75 m
C. 1.00 m
D. 1.25 m
Question 4
A 2.0 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the root mean square speed of the gas molecules.
A. 1.43 × 10^2 m s^-1
B. 1.43 × 10^3 m s^-1
C. 1.43 × 10^4 m s^-1
D. 1.43 × 10^5 m s^-1
Question 5
A 25.0 mL sample of a 0.10 M solution of NaOH is titrated with 0.10 M HCl. What is the pH of the solution after adding 25.0 mL of HCl?
A. 1.3
B. 2.3
C. 3.3
D. 4.3
Question 6
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25.0 cm$^3$ of 0.150 M HCl is titrated with 0.250 M NaOH, what is the pH of the resulting solution at the equivalence point?
A. 7.0
B. 8.0
C. 9.0
D. 10.0
Question 7
A solution of HCl is titrated with NaOH. The initial pH of the solution is 2.00. What is the pH after the addition of 25.0 mL of 0.100 M NaOH?
A. 3.00
B. 4.00
C. 5.00
D. 6.00
Question 8
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.
A. -1785.6 kJ/mol
B. -1785.9 kJ/mol
C. -1786.1 kJ/mol
D. -1786.3 kJ/mol
Question 9
A reaction has a rate cons\tant of 2.00 s-1. If the initial concentration of the reac\tant is 0.100 M, what is the concentration after 5.00 s?
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 10
A sample of a gas at 25°C and 1 atm is collected over water at 25°C. What is the partial pressure of the gas?
A. 1 atm
B. 0.5 atm
C. 0.75 atm
D. 1.25 atm
Question 11
The reaction of ozone (O3) with nitrogen dioxide (NO2) is a classic example of a redox reaction. Write the balanced chemical equation for this reaction.
A. 2O3 + 2NO2 → 2O2 + 2NO
B. 2O3 + 2NO2 → 2O2 + 2N2O
C. 2O3 + 2NO2 → 2O2 + 2NO3
D. 2O3 + 2NO2 → 2O2 + 2N2O3
Question 12
A 2.50-g sample of a compound containing only carbon and hydrogen is burned in a combustion calorimeter. The volume of CO2 produced is 1.25 L at 25°C and 1 atm. Calculate the empirical formula of the compound.
A. CH2
B. C2H4
C. C3H6
D. C4H8
Question 13
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the resulting concentration of NaCl?
A. 0.5
B. 1
C. 1.5
D. 2
Question 14
A 25.0 mL sample of a 0.10 M solution of NaOH is titrated with 0.10 M HCl. What is the pH of the solution after adding 25.0 mL of HCl?
A. 1.3
B. 2.3
C. 3.3
D. 4.3
Question 15
In the electrolysis of a solution of copper(II) sulfate, what is the primary function of the anode?
A. To produce oxygen gas
B. To produce copper metal
C. To facilitate the flow of electrons
D. To increase the concentration of copper(II) ions

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