POST UTME PAN-ATLANTIC UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows a chemical apparatus setup. What is the purpose of the condenser in this setup?
A. To cool the reaction mixture
B. To heat the reaction mixture
C. To separate the reac\tants and products
D. To mix the reac\tants and products
Question 2
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 15.0 mL of NaOH has been added?
A. 2
B. 7
C. 12
D. 14
Question 3
A sample of 1.0 g of glu\cose (C6H12O6) is dissolved in 100 mL of water. What is the concentration of the solution in g/L?
A. 10 g/L
B. 20 g/L
C. 30 g/L
D. 40 g/L
Question 4
A 50.0 g sample of a polymer is dissolved in 100.0 mL of a solvent. The resulting solution has a vis\cosity of 0.500 Pa·s. What is the molar mass of the polymer?
A. 1000 g/mol
B. 2000 g/mol
C. 5000 g/mol
D. 10000 g/mol
Question 5
The diagram below shows the structure of a polymer chain. What type of polymer is it?
A. Polyethylene
B. Polypropylene
C. Polyvinyl Chloride
D. Polystyrene
Question 6
A solution of 0.1 M sodium chloride is prepared by dissolving 10 g of sodium chloride in 1 L 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 7
A 2.5 M solution of sulfuric acid (H2SO4) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the concentration of the resulting solution?
A. 1.75 M
B. 2.25 M
C. 2.5 M
D. 3.0 M
Question 8
The diagram below shows a titration setup. What is the purpose of the pipette in this setup?
A. To measure the volume of the analyte
B. To measure the volume of the titrant
C. To mix the analyte and titrant
D. To separate the analyte and titrant
Question 9
At 25°C, 1 mole of an ideal gas occupies a volume of 24.5 L. What is the value of the gas cons\tant, R?
A. 8.3145 J/mol·K
B. 0.0821 L·atm/mol·K
C. 8.3145 L·atm/mol·K
D. 0.0821 J/mol·K
Question 10
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 that the reaction occurs at 298 K.
A. -1206.60 kJ/mol
B. -1206.61 kJ/mol
C. -1206.59 kJ/mol
D. -1206.62 kJ/mol
Question 11
A solution contains 5.0 g of glu\cose (C6H12O6) dissolved in 200 g of water. What is the mole \fraction of glu\cose in the solution?
A. 0.018
B. 0.036
C. 0.054
D. 0.072
Question 12
A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 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 13
A 50.0 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. The resulting metal has a mass of 40.0 g. What is the percentage decrease in mass?
A. 20.0%
B. 30.0%
C. 40.0%
D. 50.0%
Question 14
A sample of H2O(l) is heated from 20°C to 100°C. If the density of the water at 20°C is 1.00 g/mL and at 100°C is 0.98 g/mL, calculate the change in volume of the water.
A. -0.02 mL
B. -0.01 mL
C. 0.01 mL
D. 0.02 mL
Question 15
A polymer is composed of 80% polyethylene and 20% polypropylene. If the density of polyethylene is 0.95 g/mL and the density of polypropylene is 0.85 g/mL, what is the average density of the polymer?
A. 0.88 g/mL
B. 0.90 g/mL
C. 0.92 g/mL
D. 0.94 g/mL

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