POST UTME BABCOCK UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
At 273.15 K, 1 mole of an ideal gas occupies a volume of 22.4 L. If the temperature is increased to 373.15 K, what is the new volume of the gas, assuming it remains an ideal gas?
A. 44.8 L
B. 22.4 L
C. 11.2 L
D. 5.6 L
Question 2
A solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in 100 mL of water. If the density of the solution is 1.2 g/mL, calculate the molarity of the solution.
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 3
The reaction of 2.00 g of an unknown metal with 20.0 mL of 0.100 M HCl produces 1.00 g of H2 gas. What is the identity of the metal?
A. Mg
B. Ca
C. Fe
D. Zn
Question 4
A 2.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water. What is the volume of the solution in liters?
A. 1.00 L
B. 1.01 L
C. 1.02 L
D. 1.03 L
Question 5
A diagram of a titration setup is shown below.
A. The burette contains the acid.
B. The beaker contains the acid.
C. The burette contains the base.
D. The beaker contains the base.
Question 6
Determine the s\tandard enthalpy of formation of the compound [Cu(NH3)4]2+ from the following data: ΔHf(Cu) = - 337.3 kJ/mol, ΔHf(NH3) = - 45.9 kJ/mol, ΔHf(H2O) = - 285.8 kJ/mol, ΔHf(NH4Cl) = - 365.6 kJ/mol.
A. - 103.4 kJ/mol
B. - 123.4 kJ/mol
C. - 143.4 kJ/mol
D. - 163.4 kJ/mol
Question 7
A 2 M solution of HCl is titrated with 2 M NaOH. If 10 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 8
A sample of a hydrocarbon has a molecular formula of C5H12. What is the name of the hydrocarbon?
A. Pen\tane
B. Hexane
C. Hep\tane
D. Oc\tane
Question 9
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 10
A 0.100 M solution of NaOH is titrated with 0.100 M HCl. What is the pH of the solution after 50.0 mL of HCl has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 11
Calculate the concentration of OH^\( - \) ions in a solution of 0.1 M NaOH.
A. 0.1 M
B. 0.01 M
C. 0.001 M
D. 0.0001 M
Question 12
A solution contains 25.0 g of NaCl. If 50.0 mL of 0.100 M AgNO3 is added to the solution, what is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 13
A sample of a gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 14
A sample of a gas at 50°C and 2 atm is expanded to 1 atm. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 15
A solution contains 0.150 M NaCl. What is the concentration of Cl- ions in the solution?
A. 0.075 M
B. 0.0750 M
C. 0.0751 M
D. 0.0752 M

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