POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2023 Chemistry | Objective

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Question 1
A 2.50 M solution of HCl is titrated with 0.500 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?
A. 50.0 mL
Correct B. 62.5 mL
C. 75.0 mL
D. 100 mL

Correct Answer: B

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Question 2
A solution contains 0.100 M CaCl2 and 0.0500 M Na2SO4. What is the concentration of Ca2+ ions in the solution?
Correct A. 0.0250 M
B. 0.0500 M
C. 0.100 M
D. 0.200 M

Correct Answer: A

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Question 3
A 1.00 M solution of NaOH is titrated with 0.500 M HCl. If 20.0 mL of HCl is required to reach the equivalence point, what is the pH of the solution?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 4
A solution contains 0.0500 M CaCl2 and 0.100 M Na2SO4. What is the concentration of Ca2+ ions in the solution?
A. 0.0100 M
Correct B. 0.0200 M
C. 0.0500 M
D. 0.100 M

Correct Answer: B

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Question 5
A 2.00 M solution of HCl is titrated with 0.500 M NaOH. If 30.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?
A. 60.0 mL
B. 75.0 mL
Correct C. 90.0 mL
D. 120 mL

Correct Answer: C

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Question 6
The reaction of nitrogen dioxide with water produces nitric acid and nitric oxide. Write the balanced chemical equation for this reaction.
A. 2NO_2 + H_2O \rightarrow HNO_3 + NO
Correct B. 2NO_2 + H_2O \rightarrow HNO_3 + NO + NO_2
C. NO_2 + H_2O \rightarrow HNO_3 + NO
D. 2NO_2 + H_2O \rightarrow HNO_3

Correct Answer: B

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Question 7
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.00125 mol
Correct B. 0.00250 mol
C. 0.00375 mol
D. 0.00500 mol

Correct Answer: B

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Question 8
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. HCl
Correct B. NaOH
C. H_2SO_4
D. Na_2CO_3

Correct Answer: B

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Question 9
A solution contains 0.0500 M HCl and 0.0500 M NaOH. Calculate the pH of the solution.
A. 6.00
Correct B. 7.00
C. 8.00
D. 9.00

Correct Answer: B

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Question 10
The diagram below shows a chemical apparatus setup. Identify the subs\tance being titrated.
A. HCl
Correct B. NaOH
C. H_2SO_4
D. Na_2CO_3

Correct Answer: B

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Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. If 2.50 mol of CO2 is produced at 298 K, what is the total enthalpy change for the reaction?
Correct A. -987.5 kJ
B. -393.5 kJ
C. 393.5 kJ
D. 987.5 kJ

Correct Answer: A

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Question 12
A 2.00 M solution of HCl is titrated with 1.00 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the concentration of HCl?
A. 0.500 M
Correct B. 1.00 M
C. 2.00 M
D. 4.00 M

Correct Answer: B

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Question 13
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance is initially present, what is the amount remaining after 20.0 days?
A. 10.0 mg
B. 20.0 mg
Correct C. 30.0 mg
D. 40.0 mg

Correct Answer: C

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Question 14
A 10.0 g sample of a metal is heated in a Bunsen burner flame. If the metal is 80.0% pure, what is the mass of the impurities present?
A. 2.00 g
B. 4.00 g
Correct C. 6.00 g
D. 8.00 g

Correct Answer: C

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Question 15
A 5.00 L sample of a gas is collected over water at 25.0°C and 1.00 atm. If the vapor pressure of water at 25.0°C is 23.8 torr, what is the partial pressure of the gas?
A. 760 torr
Correct B. 750 torr
C. 740 torr
D. 730 torr

Correct Answer: B

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Question 16
A 2.00 M solution of HCl is titrated with 1.00 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the concentration of HCl?
A. 0.500 M
Correct B. 1.00 M
C. 2.00 M
D. 4.00 M

Correct Answer: B

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Question 17
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance is initially present, what is the amount remaining after 20.0 days?
A. 10.0 mg
B. 20.0 mg
Correct C. 30.0 mg
D. 40.0 mg

Correct Answer: C

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Question 18
A 10.0 g sample of a metal is heated in a Bunsen burner flame. If the metal is 80.0% pure, what is the mass of the impurities present?
A. 2.00 g
B. 4.00 g
Correct C. 6.00 g
D. 8.00 g

Correct Answer: C

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Question 19
A 5.00 L sample of a gas is collected over water at 25.0°C and 1.00 atm. If the vapor pressure of water at 25.0°C is 23.8 torr, what is the partial pressure of the gas?
A. 760 torr
B. 750 torr
C. 740 torr
D. 730 torr

Correct Answer: VIEW ANSWER

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Question 20
A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of a polymer?
A. It has a high melting point
B. It has a low boiling point
C. It is soluble in water
Correct D. It has a high molecular weight

Correct Answer: D

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Question 21
The ideal gas law is given by PV = nRT. What is the unit of the gas cons\tant R?
Correct A. J/mol·K
B. Pa·m³/mol·K
C. kg/mol·K
D. m³/mol·K

Correct Answer: A

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Question 22
A sample of gas occupies a volume of 2.5 L at a pressure of 1.5 atm. What is the pressure of the gas if the volume is reduced to 1.2 L?
Correct A. 2.1 atm
B. 2.5 atm
C. 3.0 atm
D. 3.5 atm

Correct Answer: A

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Question 23
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 24
The periodic table is arranged in a way that elements with similar properties are placed in the same group. Which of the following elements is a member of group 17?
A. C
B. N
C. O
Correct D. F

Correct Answer: D

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Question 25
A solution contains 25 g of glu\cose (C6H12O6) dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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