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Redox Reactions NEET Practice - MCQs & Revision

Solve NEET-style Redox Reactions MCQs with stepwise answers and clear explanations. Chapter notes, practice sets and mock-test style questions for quick revision.

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Redox Reactions Revision Guide for NEET Chemistry

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

For NEET 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

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for NEET Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 Redox Reactions MCQs with Answers

These public questions are selected from the exact Redox Reactions chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

NEET Chemistry · Redox Reactions · Very Very Hard

1. Oxidation in a redox step relevant to Redox Reactions means:

  • A. Gain of electrons
  • B. No oxidation-number change
  • C. Only gain of hydrogen
  • D. Loss of electrons
Answer: D
Explanation: Oxidation is electron loss.

NEET Chemistry · Redox Reactions · Very Very Hard

2. Reduction in a redox step relevant to Redox Reactions means:

  • A. Increase in oxidation number
  • B. Only loss of hydrogen
  • C. Gain of electrons
  • D. Loss of electrons
Answer: C
Explanation: Reduction is electron gain.

NEET Chemistry · Redox Reactions · Very Very Hard

3. For an electrochemical cell, oxidation occurs at:

  • A. Anode
  • B. Cathode
  • C. Salt bridge
  • D. Electrolyte only
Answer: A
Explanation: Oxidation occurs at the anode.

NEET Chemistry · Redox Reactions · Very Very Hard

4. For an electrochemical cell, reduction occurs at:

  • A. Anode
  • B. Salt bridge
  • C. Wire
  • D. Cathode
Answer: D
Explanation: Reduction occurs at the cathode.

NEET Chemistry · Redox Reactions · Very Very Hard

5. Which principle is essential when solving a quantitative problem in Redox Reactions?

  • A. Ignoring units
  • B. Assuming all coefficients are unity
  • C. Ignoring limiting conditions
  • D. Conservation of mass and charge where applicable
Answer: D
Explanation: Mass and charge conservation are fundamental.

NEET Chemistry · Redox Reactions · Very Very Hard

6. At equilibrium in a reversible system related to Redox Reactions, which statement is correct?

  • A. Reactant and product concentrations must be equal
  • B. The catalyst is consumed
  • C. Forward and reverse rates are equal
  • D. All molecular motion stops
Answer: C
Explanation: Dynamic equilibrium has equal forward and reverse rates.

NEET Chemistry · Redox Reactions · Very Very Hard

7. For a spontaneous process at constant T and P in a Redox Reactions context, ΔG is:

  • A. Always equal to ΔH
  • B. Negative
  • C. Positive
  • D. Always zero
Answer: B
Explanation: Spontaneity at constant T,P requires ΔG<0.

NEET Chemistry · Redox Reactions · Very Very Hard

8. Which statement about a catalyst in Redox Reactions is correct?

  • A. It lowers the activation barrier without changing K at fixed T
  • B. It changes ΔG°
  • C. It changes reaction enthalpy
  • D. It is always consumed
Answer: A
Explanation: Catalysts affect kinetics, not equilibrium thermodynamics.

NEET Chemistry · Redox Reactions · Very Very Hard

9. A Lewis acid encountered in Redox Reactions is an:

  • A. Anion only
  • B. Electron-pair acceptor
  • C. Electron-pair donor
  • D. Proton acceptor only
Answer: B
Explanation: Lewis acids accept electron pairs.

NEET Chemistry · Redox Reactions · Very Very Hard

10. A Lewis base encountered in Redox Reactions is an:

  • A. Electron-pair donor
  • B. Electron-pair acceptor
  • C. Cation only
  • D. Oxidising agent only
Answer: A
Explanation: Lewis bases donate electron pairs.

NEET Chemistry · Redox Reactions · Very Very Hard

11. Which is a state function useful in Redox Reactions?

  • A. Heat
  • B. Work
  • C. Path length
  • D. Enthalpy
Answer: D
Explanation: Enthalpy is path independent.

NEET Chemistry · Redox Reactions · Very Very Hard

12. The relation between standard Gibbs energy and equilibrium constant is:

  • A. ΔG°=-KRT
  • B. ΔG°=RT/K
  • C. ΔG°=-RT lnK
  • D. ΔG°=RT lnK
Answer: C
Explanation: The standard thermodynamic relation is ΔG°=-RT lnK.

NEET Chemistry · Redox Reactions · Very Very Hard

13. For a first-order kinetic process in Redox Reactions, half-life equals:

  • A. [A]0/(2k)
  • B. 0.693/k
  • C. k/0.693
  • D. 1/(k[A]0)
Answer: B
Explanation: First-order t1/2=0.693/k.

NEET Chemistry · Redox Reactions · Very Very Hard

14. For an ideal dilute solution relevant to Redox Reactions, molarity is:

  • A. Moles solute per kg solvent
  • B. Grams solute per mole solvent
  • C. Moles solvent per litre
  • D. Moles solute per litre solution
Answer: D
Explanation: M=n/V(L).

NEET Chemistry · Redox Reactions · Very Very Hard

15. For a weak acid, a larger Ka generally indicates:

  • A. No ionisation
  • B. A stronger conjugate acid
  • C. A stronger acid
  • D. A weaker acid
Answer: C
Explanation: Larger Ka means greater ionisation.

NEET Chemistry · Redox Reactions · Very Very Hard

16. At 25°C, pH+pOH for aqueous solution is:

  • A. 0
  • B. 14
  • C. 7
  • D. 1
Answer: B
Explanation: pH+pOH=pKw=14 at 25°C.

NEET Chemistry · Redox Reactions · Very Very Hard

17. A positive E°cell implies:

  • A. K<1 necessarily
  • B. No spontaneous reaction
  • C. ΔG°<0
  • D. ΔG°>0
Answer: C
Explanation: ΔG°=-nFE°.

NEET Chemistry · Redox Reactions · Very Very Hard

18. An electrophile in an organic reaction related to Redox Reactions is:

  • A. Electron-pair donor
  • B. Always negatively charged
  • C. Always a radical
  • D. Electron-pair acceptor
Answer: D
Explanation: Electrophiles accept electron pairs.

NEET Chemistry · Redox Reactions · Very Very Hard

19. The inductive effect in Redox Reactions is transmitted mainly through:

  • A. Hydrogen bonds
  • B. Ionic lattice only
  • C. Sigma bonds
  • D. Pi bonds only
Answer: C
Explanation: Inductive polarization is transmitted through sigma bonds.

NEET Chemistry · Redox Reactions · Very Very Hard

20. The actual structure represented by resonance forms is:

  • A. Always ionic
  • B. A resonance hybrid
  • C. Rapid alternation of structures
  • D. Only the least stable form
Answer: B
Explanation: Canonical structures contribute to a delocalised resonance hybrid.

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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.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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