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POST UTME UNIPORT 2024 Chemistry | Objective

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Question 1

The reaction of an alkene with a strong acid, such as HCl, results in the formation of a new compound. What is the name of this new compound?

Correct A. Alkyl halide

B. Alkene

C. Alkane

D. Alcohol

Correct Answer: A

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Question 2

A solution of 0.5 M HCl is titrated with a solution of 0.5 M NaOH. What is the pH of the solution after the addition of 25 mL of NaOH?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 3

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the solution

B. To measure the pH of the solution

C. To measure the temperature of the solution

D. To measure the density of the solution

Correct Answer: A

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Question 4

A solution of 0.5 M HCl is titrated with a solution of 0.5 M NaOH. What is the concentration of the acid after the addition of 25 mL of NaOH?

Correct A. 0.25 M

B. 0.5 M

C. 1 M

D. 2 M

Correct Answer: A

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Question 5

A diagram of a titration setup is shown below. What is the purpose of the pipette?

Correct A. To measure the volume of the solution

B. To measure the pH of the solution

C. To measure the temperature of the solution

D. To measure the density of the solution

Correct Answer: A

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Question 6

Determine the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 7

A 2.5 g sample of a non-metallic oxide is dissolved in 50 cm³ of water. If the resulting solution has a pH of 3.5, what is the molar mass of the oxide?

A. 100 g/mol

B. 200 g/mol

Correct C. 300 g/mol

D. 400 g/mol

Correct Answer: C

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Question 8

A solution of sodium hydroxide (NaOH) is prepared by dissolving 10 g of NaOH in 100 cm³ of water. What is the concentration of the solution in moles per liter?

A. 0.1 M

B. 0.5 M

Correct C. 1 M

D. 2 M

Correct Answer: C

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Question 9

A 2.5 g sample of a non-metallic oxide is dissolved in 50 cm³ of water. If the resulting solution has a pH of 3.5, what is the molar mass of the oxide?

A. 100 g/mol

B. 200 g/mol

Correct C. 300 g/mol

D. 400 g/mol

Correct Answer: C

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Question 10

A solution of sodium hydroxide (NaOH) is prepared by dissolving 10 g of NaOH in 100 cm³ of water. What is the concentration of the solution in moles per liter?

A. 0.1 M

B. 0.5 M

Correct C. 1 M

D. 2 M

Correct Answer: C

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Question 11

Determine the number of moles of carbon dioxide produced when 2.5 g of calcium carbonate is heated in a crucible.

A. 0.05 mol

Correct B. 0.10 mol

C. 0.15 mol

D. 0.20 mol

Correct Answer: B

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Question 12

A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.5 atm

Correct B. 2.0 atm

C. 2.5 atm

D. 3.0 atm

Correct Answer: B

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Question 13

A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: 2X + Cl2 → 2XCl. If 2.5 g of X is reacted with 1.5 g of Cl2, what is the limiting reac\tant?

Correct A. X

B. Cl2

C. Both X and Cl2 are limiting reac\tants

D. Neither X nor Cl2 is a limiting reac\tant

Correct Answer: A

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Question 14

A 0.5 L flask contains 0.2 mol of an ideal gas at 37°C. Calculate the number of moles of gas that will be present in a 1.0 L flask at 27°C.

A. 0.1 mol

Correct B. 0.2 mol

C. 0.3 mol

D. 0.4 mol

Correct Answer: B

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Question 15

A metal (X) reacts with oxygen gas to form a white solid. The reaction is as follows: 4X + 3O2 → 2X2O3. If 2.5 g of X is reacted with 1.5 g of O2, what is the limiting reac\tant?

A. X

Correct B. O2

C. Both X and O2 are limiting reac\tants

D. Neither X nor O2 is a limiting reac\tant

Correct Answer: B

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Question 16

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C(s) + O2(g) → CO2(g) if the s\tandard enthalpy of formation of C(s) is 0 kJ/mol.

Correct A. -393.5 kJ/mol

B. 0 kJ/mol

C. 393.5 kJ/mol

D. 0 kJ/mol

Correct Answer: A

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Question 17

What is the major product of the reaction between 2-methylpropane and HCl?

A. 2-chloro-2-methylpropane

Correct B. 2-methyl-2-chloropropane

C. 2-methyl-1-chloropropane

D. 2-methyl-2-chloropropane

Correct Answer: B

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Question 18

The s\tandard electrode potential of the reaction Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s) is 1.56 V. Calculate the s\tandard electrode potential of the reaction Zn(s) + 2Cu2+(aq) → Zn2+(aq) + 2Cu+(aq).

Correct A. 0.34 V

B. 1.56 V

C. 2.10 V

D. 0.34 V

Correct Answer: A

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Question 19

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 10 years?

A. 50 g

B. 25 g

Correct C. 12.5 g

D. 6.25 g

Correct Answer: C

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Question 20

The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) + 1/2 O2(g) → H2O(l).

Correct A. -285.8 kJ/mol

B. 0 kJ/mol

C. 285.8 kJ/mol

D. 0 kJ/mol

Correct Answer: A

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Question 21

The s\tandard electrode potential of the reaction Cu2+(aq) + 2e- → Cu(s) is 0.34 V. Calculate the s\tandard electrode potential of the reaction Cu(s) → Cu2+(aq) + 2e-.

Correct A. -0.34 V

B. 0.34 V

C. 1.56 V

D. -0.34 V

Correct Answer: A

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Question 22

The half-life of a radioactive subs\tance is 10 years. If 100 g of the subs\tance is present initially, how much will remain after 20 years?

A. 25 g

B. 12.5 g

Correct C. 6.25 g

D. 3.125 g

Correct Answer: C

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Question 23

The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C(s) + 1/2 O2(g) → CO(g).

Correct A. -110.5 kJ/mol

B. 0 kJ/mol

C. 110.5 kJ/mol

D. 0 kJ/mol

Correct Answer: A

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Question 24

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K, given that the initial concentration of NO is 0.1 M and the half-life of the reaction is 10 s.

A. 1.0 × 10^\( -2 \) s^\( -1 \)

Correct B. 2.0 × 10^\( -2 \) s^\( -1 \)

C. 3.0 × 10^\( -2 \) s^\( -1 \)

D. 4.0 × 10^\( -2 \) s^\( -1 \)

Correct Answer: B

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Question 25

A 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 20 mL of HCl has been added?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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