POST UTME REDEEMERS UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the number of moles of nitrogen gas (N2) at STP, given that the volume of the gas is 2.50 L and the temperature is 273.15 K.
A. 0.0500 mol
B. 0.100 mol
C. 0.200 mol
D. 0.500 mol
Question 2
The s\tandard enthalpy of formation (ΔHf°) of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. 110.5 kJ/mol
C. -393.5 kJ/mol
D. 393.5 kJ/mol
Question 3
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the concentration of the resulting solution?
A. 1.0 M
B. 2.0 M
C. 0.5 M
D. 0.25 M
Question 4
A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The resulting solution has a vis\cosity of 0.8 Pa·s. If the density of the polymer is 1.2 g/mL, calculate the number-average molecular weight (Mn) of the polymer.
A. 1000
B. 2000
C. 3000
D. 4000
Question 5
A 100-mL sample of a solution containing 0.500 M H2SO4 is titrated with 0.100 M NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
The diagram below shows a titration setup. Identify the component labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Test Tube
Question 7
The s\tandard enthalpy of formation (ΔHf°) of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of H2(g)?
A. 0 kJ/mol
B. 285.8 kJ/mol
C. -285.8 kJ/mol
D. -572.8 kJ/mol
Question 8
A metal rod is heated to 800°C and then quenched in water. If the temperature of the rod drops to 50°C in 10 seconds, calculate the specific heat capacity of the metal.
A. 0.1 J/g°C
B. 0.5 J/g°C
C. 1.0 J/g°C
D. 5.0 J/g°C
Question 9
The diagram below shows a simple black and white chemistry apparatus showing a titration setup. Identify the component labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Test Tube
Question 10
A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 11
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the temperature dep\endence of the dissociation cons\tant is described by the equation: \log(K) = -0.5 \log(T) + 1.5.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 12
A sample of hydrogen gas (H2) is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 0.02 atm, calculate the mole \fraction of hydrogen gas in the sample.
A. 0.95
B. 0.98
C. 0.99
D. 0.995
Question 13
A mixture of 1.0 g of sodium chloride (NaCl) and 1.0 g of calcium chloride (CaCl2) is dissolved in 100 mL of water. Calculate the molar concentration of the resulting solution.
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 14
The diagram below shows the structure of a molecule. Identify the type of bond between atoms A and B.
A. Sigma (σ) bond
B. Pi (π) bond
C. Sigma (σ) and Pi (π) bond
D. Hydrogen bond
Question 15
Determine the number of moles of carbon dioxide gas produced when 2.5 liters of carbon monoxide gas at 27°C and 1 atm is heated to 127°C at cons\tant pressure.
A. 0.25 mol
B. 0.5 mol
C. 1.0 mol
D. 1.25 mol

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