POST UTME DELSU 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a gas has a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 300 K. What is the pressure of the gas at a volume of 3.5 L and a temperature of 400 K?
A. 2.0 atm
B. 2.5 atm
C. 3.0 atm
D. 3.5 atm
Question 2
A 0.1 M solution of NaCl is prepared by dissolving 6.0 g of NaCl 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 3
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 4
A solution of HCl is prepared by dissolving 10 g of HCl in 100 mL of water. What is the molarity of the solution?
A. 1 M
B. 2 M
C. 3 M
D. 4 M
Question 5
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the solution?
A. 7
B. 8
C. 9
D. 10
Question 6
A metal M (atomic number 23) reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of M is used in the reaction, what is the mass of Cl2 required?
A. 3.2 g
B. 4.2 g
C. 5.2 g
D. 6.2 g
Question 7
A sample of a gas has a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 300 K. What is the volume of the gas at a pressure of 3.0 atm and a temperature of 400 K?
A. 1.5 L
B. 2.5 L
C. 3.5 L
D. 4.5 L
Question 8
A sample of ethanol (C2H5OH) has a mass of 15 g. If the molar mass of ethanol is 46 g/mol, what is the number of moles of ethanol present?
A. 0.3
B. 0.4
C. 0.5
D. 0.6
Question 9
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. Calculate the partial pressure of CO2 in the gas mixture.
A. ( 0.5 ) atm
B. ( 0.7 ) atm
C. ( 0.9 ) atm
D. ( 1.1 ) atm
Question 10
A 1.0 L solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution at the equivalence point?
A. 1
B. 2
C. 3
D. 4
Question 11
The s\tandard enthalpy of formation (ΔHf) for the compound CO2(g) is -393.5 kJ/mol. If 2.0 mol of CO2 is formed at 298 K, what is the total enthalpy change (ΔH) for the reaction?
A. -787 kJ
B. -786 kJ
C. -785 kJ
D. -784 kJ
Question 12
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. Calculate the pH of the resulting solution after 10 minutes.
A. ( 2.0 )
B. ( 3.0 )
C. ( 4.0 )
D. ( 5.0 )
Question 13
The s\tandard enthalpy of formation (ΔHf) for the compound H2O(l) is -285.8 kJ/mol. If 2.0 mol of H2O is formed at 298 K, what is the total enthalpy change (ΔH) for the reaction?
A. -571.6 kJ
B. -571.5 kJ
C. -571.4 kJ
D. -571.3 kJ
Question 14
Identify the functional group present in the compound: CH₃CH₂CH₂CH₂OH.
A. Alkyl group
B. Aldehyde group
C. Ketone group
D. Alcohol group
Question 15
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.5 M and 0.2 M, respectively, and the rate of reaction is 0.02 M/s after 10 minutes.
A. \( k = 0.02 , \text{M/s} \)
B. \( k = 0.04 , \text{M/s} \)
C. \( k = 0.06 , \text{M/s} \)
D. \( k = 0.08 , \text{M/s} \)

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