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POST UTME REDEEMERS UNIVERSITY 2024 Chemistry | Objective

Are you preparing for POST UTME REDEEMERS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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