POST UTME GREENFIELD UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a chemical apparatus setup. Identify the part labeled B.
A. Beaker
B. Burette
C. Conical Flask
D. Test Tube
Question 2
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the pH of the solution at the equivalence point is 8.3, what is the pKa of the acid?
A. 4.3
B. 5.3
C. 6.3
D. 7.3
Question 3
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization (DP) of 500. Calculate the molar mass of the repeating unit of the polymer.
A. 200 g/mol
B. 500 g/mol
C. 1000 g/mol
D. 2000 g/mol
Question 4
A solution contains 0.1 M CuSO4. If 25 mL of this solution is diluted to 100 mL, what is the new concentration?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 5
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Test Tube
Question 6
The diagram below shows a setup for the titration of a strong acid with a strong base. What is the purpose of the burette?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To prevent the acid from overflowing
D. To measure the temperature of the acid
Question 7
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 8
Determine the s\tandard enthalpy of formation of CO2(g) from the following data: ΔHf(CO2(g)) = -393.5 kJ/mol, ΔHf(C) = 0 kJ/mol, ΔHf(O2(g)) = 0 kJ/mol.
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
Question 9
A 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 1
B. 2
C. 3
D. 4
Question 10
Determine the oxidation state of the underlined atom in the compound [Cr\( H_2O \)_5Cl]Cl_2.
A. +3
B. +2
C. +1
D. +6
Question 11
A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 12
Calculate 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, ΔHf(C(s)) = 0 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.60 kJ/mol
C. -1206.60 kJ/mol
D. -1206.60 kJ/mol
Question 13
A solution of HCl is prepared by dissolving 25 g of HCl in 250 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
A sample of polystyrene contains 25% by mass of styrene monomer. If 50 g of the sample is burned, what is the mass of styrene monomer combusted?
A. 6.25 g
B. 12.5 g
C. 25.0 g
D. 50.0 g
Question 15
A 25.0 mL sample of 0.150 M HCl is mixed with 50.0 mL of 0.100 M NaOH. Calculate the number of moles of HCl that react with NaOH.
A. 0.00375
B. 0.00425
C. 0.00475
D. 0.00525

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