POST UTME BELLS UNIVERSITY 2022 Chemistry | Objective

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Question 1
The diagram below shows a titration setup.
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 2
The reaction of 1-propanol with concentrated sulfuric acid produces a compound with the molecular formula C3H7OS. Identify the product.
A. Propyl hydrogen sulfate
B. Propyl sulfate
C. Propyl sulfite
D. Propyl sulfonic acid
Question 3
The process of removing impurities from a solution is known as?
A. Crystallization
B. Distillation
C. Filtration
D. Evaporation
Question 4
The compound with the molecular formula C2H6O is classified as?
A. Aldehyde
B. Ester
C. Alcohol
D. Ketone
Question 5
A sample of a non-metallic oxide, X2O3, has a mass of 25.0 g. If the molar mass of X2O3 is 160 g/mol, calculate the number of moles of X2O3 present in the sample.
A. 0.156 mol
B. 0.1565 mol
C. 0.1569 mol
D. 0.1573 mol
Question 6
A solution contains 0.2 M NaCl. What is the concentration of Cl- ions in the solution?
A. 0.2 M
B. 0.1 M
C. 0.4 M
D. 0.3 M
Question 7
The reaction of 1-bu\tanol with concentrated sulfuric acid produces a compound with the molecular formula C4H9OS. Identify the product.
A. Butyl hydrogen sulfate
B. Butyl sulfate
C. Butyl sulfite
D. Butyl sulfonic acid
Question 8
A 2.5 M solution of HCl is titrated with a 0.5 M solution of NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl present in 100 mL of the solution?
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 9
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -285.8 kJ/mol
Question 10
The s\tandard enthalpy of combustion of methane is -890.3 kJ/mol. What is the s\tandard enthalpy of formation of methane?
A. -74.8 kJ/mol
B. -890.3 kJ/mol
C. -393.5 kJ/mol
D. -74.8 kJ/mol
Question 11
A sample of a hydrocarbon has a molecular formula of C5H12. What is the IUPAC name of the compound?
A. 2-methylbu\tane
B. 2-methylpen\tane
C. 3-methylbu\tane
D. 3-methylpen\tane
Question 12
A 0.500 g sample of a polymer is dissolved in 25.0 mL of solvent. If the resulting solution has a vis\cosity of 0.800 Pa·s, what is the molar mass of the polymer?
A. 500 g/mol
B. 1000 g/mol
C. 2000 g/mol
D. 5000 g/mol
Question 13
A sample of polystyrene has a density of 1.05 g/cm^3. If 25.0 g of the polymer is dissolved in 100.0 mL of toluene, what is the molar mass of the polymer?
A. 50000 g/mol
B. 60000 g/mol
C. 70000 g/mol
D. 80000 g/mol
Question 14
The diagram below shows a chemical apparatus setup.
A. The test tube contains the acid.
B. The burette contains the base.
C. The test tube contains the base.
D. The burette contains the acid.
Question 15
The diagram below shows a titration setup. Identify the part labeled 'A'.
A. Burette
B. Beaker
C. Conical flask
D. Burette s\tand

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