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Redox Reactions JENPAS MCQ & Practice Questions

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Redox Reactions Revision Guide for JENPAS Chemistry

Redox Reactions focuses on electron transfer and oxidation-state changes. It supports electrochemistry, inorganic reactions and many analytical calculations.

For JENPAS Chemistry, practise oxidation-number rules, identifying oxidising and reducing agents, balancing redox equations and equivalent concepts where they are part of the syllabus.

Important Topics

  • Oxidation number rules
  • Oxidation and reduction
  • Oxidising and reducing agents
  • Balancing by oxidation-number method
  • Ion-electron method
  • Redox stoichiometry

Important Formulae & Relationships

  • Increase in oxidation number = oxidation
  • Decrease in oxidation number = reduction
  • Total electrons lost = total electrons gained in a balanced redox process

Use formulas only after checking the required units, sign convention and assumptions for the question.

What to practise in Redox Reactions

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Redox Reactions before attempting MCQs.

Exam-style MCQs

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Performance Practice

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Top 20 Redox Reactions MCQs with Answers

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JENPAS Chemistry · Redox Reactions · Very Very Hard

1. Reduction is best defined as:

  • A. Increase in oxidation number
  • B. Gain of electrons
  • C. Loss of electrons
  • D. Gain of oxygen
Answer: B
Explanation: Reduction involves gain of electrons and a decrease in oxidation number.

JENPAS Chemistry · Redox Reactions · Very Very Hard

2. In the ion-electron method, oxidation and reduction half-reactions are balanced separately for:

  • A. Only oxygen
  • B. Atoms and charge
  • C. Only mass
  • D. Only charge
Answer: B
Explanation: Half-reaction balancing ensures both mass and charge conservation.

JENPAS Chemistry · Redox Reactions · Very Very Hard

3. JENPAS advanced: Reduction is best defined as:

  • A. Loss of electrons
  • B. Gain of oxygen
  • C. Increase in oxidation number
  • D. Gain of electrons
Answer: D
Explanation: Reduction involves gain of electrons and a decrease in oxidation number.

JENPAS Chemistry · Redox Reactions · Very Very Hard

4. JENPAS advanced: In the ion-electron method, oxidation and reduction half-reactions are balanced separately for:

  • A. Only mass
  • B. Only charge
  • C. Only oxygen
  • D. Atoms and charge
Answer: D
Explanation: Half-reaction balancing ensures both mass and charge conservation.

JENPAS Chemistry · Redox Reactions · Very Very Hard

5. Redox reasoning: Reduction is best defined as:

  • A. Increase in oxidation number
  • B. Gain of electrons
  • C. Loss of electrons
  • D. Gain of oxygen
Answer: B
Explanation: Reduction involves gain of electrons and a decrease in oxidation number.

JENPAS Chemistry · Redox Reactions · Very Very Hard

6. Redox reasoning: Oxidation number of oxygen in H2O2 is:

  • A. -2
  • B. 0
  • C. +1
  • D. -1
Answer: D
Explanation: Peroxide oxygen has oxidation state -1.

JENPAS Chemistry · Redox Reactions · Very Very Hard

7. Oxidation is best defined as:

  • A. Gain of hydrogen only
  • B. Decrease in oxidation number
  • C. Loss of electrons
  • D. Gain of electrons
Answer: C
Explanation: Oxidation involves loss of electrons and an increase in oxidation number.

JENPAS Chemistry · Redox Reactions · Very Very Hard

8. Oxidation number of oxygen in H2O2 is:

  • A. -2
  • B. 0
  • C. +1
  • D. -1
Answer: D
Explanation: Peroxide oxygen has oxidation state -1.

JENPAS Chemistry · Redox Reactions · Very Very Hard

9. A reaction in which oxidation and reduction occur simultaneously is called:

  • A. Redox reaction
  • B. Neutralisation reaction only
  • C. Precipitation reaction only
  • D. Hydrolysis reaction
Answer: A
Explanation: Electron loss and gain occur together in a redox process.

JENPAS Chemistry · Redox Reactions · Very Very Hard

10. Oxidation number method balances a redox reaction by equating:

  • A. Only atoms
  • B. Only charge
  • C. Only oxygen atoms
  • D. Total increase and total decrease in oxidation number
Answer: D
Explanation: Electron loss and gain are matched via oxidation-number changes.

JENPAS Chemistry · Redox Reactions · Very Very Hard

11. A substance with an element in its highest oxidation state often acts as:

  • A. Neither
  • B. Always acid
  • C. Oxidising agent
  • D. Reducing agent
Answer: C
Explanation: It can usually only be reduced from its highest oxidation state.

JENPAS Chemistry · Redox Reactions · Very Very Hard

12. A substance with an element in its lowest oxidation state often acts as:

  • A. Always base
  • B. Reducing agent
  • C. Oxidising agent
  • D. Neither
Answer: B
Explanation: It can usually only be oxidised from its lowest state.

JENPAS Chemistry · Redox Reactions · Very Very Hard

13. JENPAS advanced: Oxidation is best defined as:

  • A. Loss of electrons
  • B. Gain of electrons
  • C. Gain of hydrogen only
  • D. Decrease in oxidation number
Answer: A
Explanation: Oxidation involves loss of electrons and an increase in oxidation number.

JENPAS Chemistry · Redox Reactions · Very Very Hard

14. JENPAS advanced: Oxidation number of oxygen in H2O2 is:

  • A. +1
  • B. -1
  • C. -2
  • D. 0
Answer: B
Explanation: Peroxide oxygen has oxidation state -1.

JENPAS Chemistry · Redox Reactions · Very Very Hard

15. JENPAS advanced: A reaction in which oxidation and reduction occur simultaneously is called:

  • A. Precipitation reaction only
  • B. Hydrolysis reaction
  • C. Redox reaction
  • D. Neutralisation reaction only
Answer: C
Explanation: Electron loss and gain occur together in a redox process.

JENPAS Chemistry · Redox Reactions · Very Very Hard

16. JENPAS advanced: Oxidation number method balances a redox reaction by equating:

  • A. Only oxygen atoms
  • B. Total increase and total decrease in oxidation number
  • C. Only atoms
  • D. Only charge
Answer: B
Explanation: Electron loss and gain are matched via oxidation-number changes.

JENPAS Chemistry · Redox Reactions · Very Very Hard

17. JENPAS advanced: A substance with an element in its highest oxidation state often acts as:

  • A. Oxidising agent
  • B. Reducing agent
  • C. Neither
  • D. Always acid
Answer: A
Explanation: It can usually only be reduced from its highest oxidation state.

JENPAS Chemistry · Redox Reactions · Very Very Hard

18. JENPAS advanced: A substance with an element in its lowest oxidation state often acts as:

  • A. Oxidising agent
  • B. Neither
  • C. Always base
  • D. Reducing agent
Answer: D
Explanation: It can usually only be oxidised from its lowest state.

JENPAS Chemistry · Redox Reactions · Very Very Hard

19. Redox reasoning: Oxidation is best defined as:

  • A. Gain of hydrogen only
  • B. Decrease in oxidation number
  • C. Loss of electrons
  • D. Gain of electrons
Answer: C
Explanation: Oxidation involves loss of electrons and an increase in oxidation number.

JENPAS Chemistry · Redox Reactions · Very Very Hard

20. Redox reasoning: An oxidising agent itself undergoes:

  • A. Reduction
  • B. Oxidation
  • C. Neutralisation
  • D. Hydrolysis
Answer: A
Explanation: An oxidising agent accepts electrons and is reduced.

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Redox Reactions Practice Tests

Redox Reactions Frequently Asked Questions

How do I identify the oxidising agent?

The oxidising agent causes another species to be oxidised and is itself reduced.

What is the safest way to balance redox equations?

Use either the oxidation-number method or ion-electron method systematically, then verify both atom balance and total charge.

Why is oxidation state useful?

It provides a bookkeeping method for identifying electron-transfer changes even when electrons do not appear explicitly in the written equation.

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