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POST UTME NILE UNIVERSITY 2018 Chemistry | Objective

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Question 1

The reaction between nitrogen dioxide and water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. What is the oxidation state of nitrogen in the product HNO3?

Correct A. +5

B. +3

C. +1

D. -1

Correct Answer: A

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Question 2

A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in water to make 250 mL of solution. What is the molarity of the solution?

A. 5 M

B. 10 M

Correct C. 2.5 M

D. 1 M

Correct Answer: C

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Question 3

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

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To separate the titrant and analyte

Correct Answer: A

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Question 4

A 0.1 M solution of hydrochloric acid (HCl) is prepared by dissolving 3.5 g of HCl in water to make 250 mL of solution. What is the concentration of the solution in terms of molarity?

Correct A. 0.1 M

B. 0.5 M

C. 1 M

D. 2 M

Correct Answer: A

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Question 5

A diagram of a chemical apparatus setup is shown below. What is the purpose of the condenser in this setup?

Correct A. To cool the vapor

B. To heat the vapor

C. To separate the vapor from the liquid

D. To mix the vapor with the liquid

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 25.0 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 10.0 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 8

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 9

A 25.0 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20.0 mL of NaOH has been added?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 10

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 10.0 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 11

Determine the pH of a 0.1 M solution of HCN in water at 25°C, given that the dissociation cons\tant of HCN is 6.2 × 10^-10.

A. 4.5

Correct B. 5.5

C. 6.5

D. 7.5

Correct Answer: B

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Question 12

A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?

A. 1

Correct B. 7

C. 10

D. 14

Correct Answer: B

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Question 13

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?

A. 0

Correct B. 7

C. 14

D. 10

Correct Answer: B

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Question 14

A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the pH of the resulting solution?

A. 1

Correct B. 7

C. 10

D. 14

Correct Answer: B

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Question 15

A 0.1 M solution of HCN is mixed with a 0.1 M solution of NaOH. What is the pH of the resulting solution?

A. 4.5

Correct B. 5.5

C. 6.5

D. 7.5

Correct Answer: B

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Question 16

Determine the s\tandard cell potential for the reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s). Given that the s\tandard reduction potential for Cu2+/Cu is +0.34 V and for Zn2+/Zn is -0.76 V.

Correct A. +1.10 V

B. +0.58 V

C. -0.42 V

D. -1.10 V

Correct Answer: A

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Question 17

A sample of a non-metallic oxide, X2O3, has a molar mass of 192 g/mol. If the oxide is composed of X and O atoms in a 2:3 ratio, determine the atomic mass of X.

A. 40 g/mol

Correct B. 60 g/mol

C. 80 g/mol

D. 120 g/mol

Correct Answer: B

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Question 18

A 2.5 M solution of HCl is mixed with a 1.5 M solution of NaOH. If the reaction is complete, what is the resulting concentration of the salt formed?

Correct A. 1.0 M

B. 1.5 M

C. 2.0 M

D. 2.5 M

Correct Answer: A

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Question 19

A 50 mL sample of a solution containing 0.5 M NaCl is diluted to 100 mL. What is the resulting concentration of the solution?

A. 0.1 M

Correct B. 0.25 M

C. 0.5 M

D. 1.0 M

Correct Answer: B

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Question 20

A 100 mL sample of a solution containing 2.0 M H2SO4 is mixed with 100 mL of water. What is the resulting concentration of the solution?

A. 1.0 M

B. 1.5 M

Correct C. 2.0 M

D. 2.5 M

Correct Answer: C

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Question 21

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

Correct A. -110.5 kJ/mol

B. -110.5 kJ/mol

C. -110.5 kJ/mol

D. -110.5 kJ/mol

Correct Answer: A

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Question 22

A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the resulting pH?

Correct A. 0.500

B. 0.500

C. 0.500

D. 0.500

Correct Answer: A

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Question 23

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?

Correct A. +0.80 V

B. +0.80 V

C. +0.80 V

D. +0.80 V

Correct Answer: A

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Question 24

A sample of iron metal is heated in a vacuum to produce iron oxide. What is the balanced equation for this reaction?

Correct A. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{Fe}_2\text{O}_3(s)

B. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{FeO}(s)

C. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{Fe}_3\text{O}_4(s)

D. \text{Fe}(s) + \text{O}_2(g) \rightarrow \text{Fe}_2\text{O}_2(s)

Correct Answer: A

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Question 25

A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the resulting pH?

Correct A. 0.500

B. 0.500

C. 0.500

D. 0.500

Correct Answer: A

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