POST UTME REDEEMERS UNIVERSITY 2024 Chemistry | Objective

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Question 1 View Details
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, ΔHf(C(s)) = 0 kJ/mol.
Correct A. -1206.60 kJ/mol
B. -1206.61 kJ/mol
C. -1206.59 kJ/mol
D. -1206.62 kJ/mol

Correct Answer: A

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Question 2 View Details
A 0.500 M solution of NaOH is titrated with a 0.500 M solution of HCl. What is the pH of the solution after 25.0 mL of HCl has been added?
A. 8.00
Correct B. 7.00
C. 6.00
D. 9.00

Correct Answer: B

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Question 3 View Details
The diagram below shows a titration curve for the reaction between NaOH and HCl. What is the pH of the solution at point A?
Correct A. 7.00
B. 8.00
C. 9.00
D. 10.00

Correct Answer: A

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Question 4 View Details
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1.00 atm. What is the partial pressure of CO2 in the gas mixture?
Correct A. 0.90 atm
B. 0.95 atm
C. 0.99 atm
D. 1.00 atm

Correct Answer: A

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Question 5 View Details
The diagram below shows a setup for the electrolysis of water. What is the purpose of the anode?
A. To produce H2 gas
Correct B. To produce O2 gas
C. To produce H+ ions
D. To produce OH- ions

Correct Answer: B

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Question 6 View Details
The reaction between zinc metal and copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the product Cu(s)?
A. 0
B. +1
Correct C. +2
D. -2

Correct Answer: C

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Question 7 View Details
A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 8 View Details
The diagram below shows a titration setup. What is the purpose of the burette?
Correct A. To measure the volume of the solution
B. To mix the solution with the analyte
C. To add the analyte to the solution
D. To measure the pH of the solution

Correct Answer: A

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Question 9 View Details
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l). What is the type of reaction?
A. Synthesis reaction
B. Decomposition reaction
C. Single displacement reaction
Correct D. Double displacement reaction

Correct Answer: D

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Question 10 View Details
A solution contains 0.5 M H2SO4. What is the concentration of H+ ions in the solution?
A. 0.25 M
Correct B. 0.5 M
C. 1 M
D. 2 M

Correct Answer: B

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Question 11 View Details
Determine the s\tandard Gibbs free energy change \( ΔG^circ \) for the reaction: 2Ag^+(aq) + 2e^-→ 2Ag(s) at 298 K. Given: E^circ = 0.80 V, R = 8.314 J/\( mol*K \), T = 298 K.
Correct A. -1.52 kJ/mol
B. -1.52 kJ/mol
C. -1.52 kJ/mol
D. -1.52 kJ/mol

Correct Answer: A

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Question 12 View Details
A 0.500 M solution of HCl is mixed with a 0.250 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 13 View Details
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 g of the subs\tance initially exists, what is the mass of the subs\tance remaining after 20.0 days?
Correct A. 25.0 g
B. 50.0 g
C. 75.0 g
D. 100.0 g

Correct Answer: A

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Question 14 View Details
A 1.00 M solution of HNO3 is mixed with a 1.00 M solution of KOH. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 15 View Details
A 0.500 M solution of HCl is mixed with a 0.250 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 16 View Details
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 9.00, what is the volume of NaOH added?
A. 10.0 mL
Correct B. 15.0 mL
C. 20.0 mL
D. 25.0 mL

Correct Answer: B

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Question 17 View Details
A solution contains 0.500 M NaCl and 0.500 M NaOH. What is the pH of the solution?
A. 9.00
Correct B. 10.00
C. 11.00
D. 12.00

Correct Answer: B

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Question 18 View Details
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 25.0 mL of NaOH has been added?
A. 8.00
Correct B. 9.00
C. 10.00
D. 11.00

Correct Answer: B

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Question 19 View Details
A solution contains 0.500 M NaCl and 0.500 M NaOH. What is the concentration of OH- ions in the solution?
A. 0.250 M
Correct B. 0.500 M
C. 0.750 M
D. 1.000 M

Correct Answer: B

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Question 20 View Details
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 10.0 mL of NaOH has been added?
A. 7.00
B. 8.00
Correct C. 9.00
D. 10.00

Correct Answer: C

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Question 21 View Details
A solution contains 0.500 M NaCl and 0.500 M NaOH. What is the concentration of Cl- ions in the solution?
A. 0.250 M
Correct B. 0.500 M
C. 0.750 M
D. 1.000 M

Correct Answer: B

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Question 22 View Details
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 20.0 mL of NaOH has been added?
A. 8.00
Correct B. 9.00
C. 10.00
D. 11.00

Correct Answer: B

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Question 23 View Details
A solution contains 0.500 M NaCl and 0.500 M NaOH. What is the concentration of OH- ions in the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.000 M

Correct Answer: VIEW ANSWER

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Question 24 View Details
The rate cons\tant (k) of a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 300 K, what is the value of the rate cons\tant (k) if the pre-exponential factor (A) is 1.0 x 10^10 s^-1?
A. 1.0 x 10^4 s^-1
B. 1.0 x 10^5 s^-1
Correct C. 1.0 x 10^6 s^-1
D. 1.0 x 10^7 s^-1

Correct Answer: C

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Question 25 View Details
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added to 20 mL of HCl, what is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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