POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas at s\tandard temperature and pressure (STP) occupies a volume of 22.4 L. If the temperature is increased to 373 K and the pressure remains cons\tant, what is the new volume of the gas?
A. 25.6 L
B. 26.4 L
C. 27.2 L
D. 28.0 L
Question 2
A diagram shows a simple black and white chemistry apparatus showing a chromatography setup. The diagram shows that the chromatography column contains a solution of iodine (I2) and the solvent contains a solution of ethanol (C2H5OH). If 10.0 mL of iodine solution is added to the chromatography column, what is the new volume of iodine solution in the chromatography column?
A. 5.0 mL
B. 7.5 mL
C. 10.0 mL
D. 12.5 mL
Question 3
What is the major product of the reaction between CH3CH2CH2OH and HCl?
A. CH3CH2CH2Cl
B. CH3CH2CH2OH
C. CH3CH2CH2OCl
D. CH3CH2CH2CH2Cl
Question 4
A 2.50 g sample of sulfur is burned in oxygen to produce sulfur dioxide gas. The reaction is: S(s) + O2(g) → SO2(g). If 1.50 L of SO2 gas is collected at 25°C and 1 atm, what is the percentage yield of the reaction?
A. 50%
B. 75%
C. 80%
D. 90%
Question 5
A solution contains 35.0 g of glu\cose (C6H12O6) dissolved in 250.0 mL of water. What is the molarity of the solution?
A. 0.50 M
B. 0.75 M
C. 1.00 M
D. 1.25 M
Question 6
Determine the molecular formula of the compound formed by the reaction of 0.5 mol of nitrogen with 1.0 mol of oxygen.
A. N2O
B. NO
C. N2O2
D. NO2
Question 7
Determine the s\tandard enthalpy of formation of CaO(s) from the following data: ΔHf(Ca)=-178.2 kJ/mol, ΔHf(O)=0 kJ/mol, ΔHf(CaO)=?
A. -178.2 kJ/mol
B. 178.2 kJ/mol
C. -222.8 kJ/mol
D. 222.8 kJ/mol
Question 8
A metal oxide, M2O3, has a molar mass of 223.9 g/mol. If the molar mass of oxygen is 16.0 g/mol, what is the molar mass of the metal (M)?
A. 45.95 g/mol
B. 46.95 g/mol
C. 47.95 g/mol
D. 48.95 g/mol
Question 9
A diagram shows a titration setup with a burette containing a solution of sodium hydroxide (NaOH) and a flask containing a solution of hydrochloric acid (HCl). The diagram shows that the burette contains 25.0 mL of NaOH solution. If 10.0 mL of HCl solution is added to the flask, what is the new volume of NaOH solution in the burette?
A. 15.0 mL
B. 20.0 mL
C. 25.0 mL
D. 30.0 mL
Question 10
A diagram shows a simple black and white chemistry apparatus showing a distillation setup. The diagram shows that the distillation flask contains a solution of ethanol (C2H5OH) and the condenser contains a solution of water (H2O). If 50.0 mL of ethanol solution is distilled, what is the new volume of ethanol solution in the distillation flask?
A. 25.0 mL
B. 30.0 mL
C. 35.0 mL
D. 40.0 mL
Question 11
In the periodic table, which of the following elements belongs to the group 17 and period 3?
A. Nitrogen
B. Oxygen
C. Fluorine
D. Chlorine
Question 12
A 1.00-mol sample of H2 is mixed with 1.00 mol of O2 in a 1.00-L container at 25°C. What is the partial pressure of H2 in the gas mixture?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 13
A 1.00-mol sample of CO2 is collected over water at 25°C and 1 atm. If the partial pressure of CO2 is 0.800 atm, what is the mole \fraction of CO2 in the gas mixture?
A. 0.800
B. 0.600
C. 0.400
D. 0.200
Question 14
A 0.500 M solution of NaOH is mixed with 0.500 M HCl. What is the pH of the resulting solution?
A. 7.00
B. 7.00
C. 7.00
D. 7.00
Question 15
The s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol. Calculate the s\tandard enthalpy of formation of CO2(g) if the s\tandard enthalpy of formation of CaCO3(s) is -1207.59 kJ/mol and that of C(s) is 0 kJ/mol.
A. -393.5 kJ/mol
B. -393.5 kJ/mol
C. -393.5 kJ/mol
D. -393.5 kJ/mol

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