Redox Reaction Test

 

GENIUS SCIENCE ACADEMY

Class: XI (Chemistry)

Subject: Redox Reactions

Time: 2½ Hours

Maximum Marks: 100

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Section A – One Line Questions (25 Marks)

Answer all questions in one line.

1. What does the abbreviation ‘redox’ stand for?
2. Define oxidation according to the classical concept.
3. Define oxidation in terms of electron transfer.
4. Define reduction in terms of electron transfer.
5. Define an oxidising agent in terms of oxidation number.
6. Define a reducing agent in terms of oxidation number.
7. Define a reductant in terms of electron transfer.
8. Define an oxidant in terms of electron transfer.
9. State the oxidation number of an atom in its free state.
10. What is the oxidation number of Fluorine in all its compounds?
11. State any one rule for assigning oxidation number to Hydrogen.
12. State any one rule for assigning oxidation number to Halogens.
13. What is a displacement reaction?
14. What is meant by a metal displacement reaction?
15. What is meant by a non-metal displacement reaction?
16. Define combustion in terms of oxygen.
17. What is a salt bridge?
18. Name the enzyme responsible for the browning of a cut apple.
19. What is the driving force behind the reactions of elements?
20. What is meant by oxidation number?
21. What is the function of a voltmeter in an electrochemical cell?
22. What is corrosion?
23. What is meant by electrode potential?
24. What is a combination reaction?
25. What is a decomposition reaction?

Section B – Short Answer Questions (Answer any 10) (20 Marks)

1. State the rules for assigning oxidation numbers to Hydrogen and Halogens.
2. Distinguish between metal and non-metal displacement reactions with one example each.
3. Why is the browning of a cut apple considered a redox reaction?
4. Why does an old car bumper change its colour?
5. Explain why new batteries become useless after some days.
6. What is a salt bridge and what is its role in a Daniel cell?
7. What is the oxidation number of Fluorine in its compounds? Explain why.
8. Arrange Zinc, Copper, and Silver in decreasing order of their electron-releasing tendency based on the metal activity series.
9. Define and distinguish between Combination and Decomposition redox reactions.
10. What is meant by corrosion? Explain with one example.
11. Define standard hydrogen electrode (SHE).
12. What is meant by electrochemical series?

Section C – Brief Answer Questions (Answer any 10) (30 Marks)

1. Explain the construction of a Daniel cell with a focus on the electrical circuit.
2. Define standard hydrogen electrode (SHE) and explain why it is used as a reference electrode.
3. Write the chemical formulae for:
   (i) Thallium(I) sulphate
   (ii) Chromium(III) oxide
   (iii) Bismuth(V) chloride
4. Describe the change in color of the Statue of Liberty in the context of redox reactions.
5. Explain the process of rusting of iron in terms of oxidation and reduction.
6. Explain the concept of oxidation number with suitable examples.
7. Write a short note on corrosion and its prevention methods.
8. Explain the working of a galvanic cell with a neat diagram.
9. What is the driving force behind redox reactions? Explain briefly.
10. Differentiate between oxidising and reducing agents with examples.
11. Explain metal displacement reaction with a balanced chemical equation.
12. Explain non-metal displacement reaction with a balanced chemical equation.
13. Describe the role of oxidation number in balancing redox reactions.
14. Explain combustion as a redox reaction with an example.

Section D – Long Answer Questions (Answer any 5) (25 Marks)

1. Explain redox reactions in terms of electron transfer and oxidation number changes with suitable examples.
2. Describe the construction and working of a Daniel cell with a labelled diagram and chemical reactions involved.
3. Explain corrosion as a redox reaction. Discuss the rusting of iron and methods to prevent it.
4. Define oxidation and reduction according to classical and electronic concepts. Compare both with examples.
5. Explain the electrochemical series and its applications in predicting displacement reactions.
6. Discuss the rules for assigning oxidation numbers and illustrate with suitable examples.
7. Explain combination, decomposition, displacement and combustion reactions as types of redox reactions with balanced equations.

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End of Question Paper