POST UTME REDEEMERS UNIVERSITY 2022 Chemistry | Objective

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Question 1
Determine the number of unpaired electrons in the ground state of a neutral atom of the element with atomic number 13.
Correct A. 4
B. 6
C. 8
D. 10

Correct Answer: A

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Question 2
The reaction of sodium with chlorine is represented by the equation: 2Na(s) + Cl_(2)(g) → 2NaCl(s). What is the oxidation state of sodium in this reaction?
A. 0
Correct B. +1
C. -1
D. +2

Correct Answer: B

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Question 3
The half-life of a radioactive subs\tance is 5 years. If 100g of the subs\tance initially exists, what is the mass of the subs\tance remaining after 10 years?
Correct A. 25g
B. 50g
C. 75g
D. 100g

Correct Answer: A

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Question 4
A sample of a gas at 300K and 1 atm occupies a volume of 2L. What is the new volume of the gas at 400K and 2 atm?
A. 1L
B. 2L
Correct C. 4L
D. 8L

Correct Answer: C

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Question 5
The diagram below represents a titration setup. What is the purpose of the burette in this setup?
A. To measure the volume of the solution
B. To mix the solution with the analyte
Correct C. To add the titrant to the analyte
D. To measure the pH of the solution

Correct Answer: C

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Question 6
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the equivalence point is reached at 35.0 mL of NaOH, what is the pH of the resulting solution?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 7
The diagram below shows a titration setup. If 25.0 mL of 0.100 M HCl is titrated with 0.100 M NaOH, what is the pH of the resulting solution?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 8
The atomic number of an element is 12. What is the number of protons in the nucleus of an atom of this element?
A. 10
Correct B. 12
C. 14
D. 16

Correct Answer: B

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Question 9
A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, what is the partial pressure of the nitrogen gas?
A. 0.95
B. 0.98
Correct C. 1.00
D. 1.02

Correct Answer: C

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Question 10
The diagram below shows a graph of the boiling points of some ha\logen compounds. Which compound has the highest boiling point?
A. CHCl3
B. CHBr3
Correct C. CHI3
D. CBrCl3

Correct Answer: C

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Question 11
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.75 g, calculate the mass of carbon dioxide gas produced.
Correct A. 1.25 g
B. 1.75 g
C. 2.00 g
D. 2.50 g

Correct Answer: A

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Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) given that the s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol and that of CO2(g) is -393.5 kJ/mol.
A. -179.8 kJ/mol
B. -179.9 kJ/mol
Correct C. -180.0 kJ/mol
D. -180.1 kJ/mol

Correct Answer: C

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Question 13
A 0.500 M solution of HCl is titrated with a 0.500 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 25.0 mL
Correct B. 50.0 mL
C. 75.0 mL
D. 100 mL

Correct Answer: B

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Question 14
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 0.500 L
Correct B. 0.750 L
C. 1.00 L
D. 1.25 L

Correct Answer: B

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Question 15
The s\tandard reduction potential of the Cu2+/Cu couple is +0.34 V. What is the s\tandard reduction potential of the Ag+/Ag couple if the s\tandard reduction potential of the Ag+/Ag couple is +0.80 V?
A. +0.46 V
B. +0.50 V
Correct C. +0.54 V
D. +0.58 V

Correct Answer: C

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Question 16
A solution of 0.1 M NaCl is mixed with a solution of 0.1 M Na2SO4. If the total volume of the resulting solution is 100 mL, what is the concentration of Cl- ions in the solution?
A. 0.1 M
Correct B. 0.05 M
C. 0.2 M
D. 0.15 M

Correct Answer: B

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Question 17
The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is present initially, how much of the subs\tance will remain after 20 days?
A. 50 mg
B. 25 mg
Correct C. 12.5 mg
D. 6.25 mg

Correct Answer: C

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Question 18
A sample of 1.0 L of a gas at 2.0 atm and 25°C is allowed to expand to 2.0 L. What is the final pressure of the gas?
A. 1.0 atm
Correct B. 1.5 atm
C. 2.0 atm
D. 2.5 atm

Correct Answer: B

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Question 19
A 10.0 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the titration?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 20
A 25.0 mL sample of a solution containing 0.1 M NaOH is mixed with 25.0 mL of a solution containing 0.1 M HCl. What is the pH of the resulting solution?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 21
The reaction of chlorine gas with sodium hydroxide solution is a classic example of a redox reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
A. 2NaOH + Cl2 → NaCl + NaClO + H2O
Correct B. 2NaOH + Cl2 → NaClO + NaCl + H2O
C. 2NaOH + Cl2 → NaCl + H2O
D. 2NaOH + Cl2 → NaClO + H2O

Correct Answer: B

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Question 22
The following diagram represents a simple electrolysis setup. Identify the part labeled A.
Correct A. A is the cathode
B. A is the anode
C. A is the electrolyte
D. A is the power source

Correct Answer: A

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Question 23
The following equation represents a chemical reaction involving nitrogen and oxygen gases. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
Correct A. N2 + O2 → 2NO
B. N2 + O2 → 2NO2
C. N2 + O2 → 2N2O
D. N2 + O2 → 2NO3

Correct Answer: A

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Question 24
The following diagram represents a simple apparatus for measuring the rate of reaction. Identify the part labeled B.
A. B is the measuring cylinder
B. B is the thermometer
Correct C. B is the reaction vessel
D. B is the stirrer

Correct Answer: C

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Question 25
The following equation represents a chemical reaction involving sulfur and oxygen gases. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
Correct A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5

Correct Answer: A

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