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Chemistry - Redox Reactions

Practise 21 AIIMS previous year questions on Redox Reactions, compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Redox Reactions has been asked in 13 of the 19 years of AIIMS papers analysed (2001–2019), with 21 questions in all. 62% of them were easy, 19% moderate and 19% tough. Most of its questions came from 2011, with 5 questions that year. In the last three years (2017–2019) it had 3 questions across 5 papers, about 0.6 per paper.

The chapter's 6 topics are not weighted equally: Redox titration (7 questions, 33%), Oxidation number (5 questions, 24%), and Oxidation and Reduction Reactions (4 questions, 19%) have been asked the most. Redox titration has produced the most tough questions (1).

  1. 1Assertion : , and act as oxidants. Reason : In and central atom is in its highest oxidation state.25 May, 2019Oxidation number
  2. 2When is titrated with then at neutral point the colour of phenolphthalein becomes colourless from pink due to26 May, 2018Redox titration
  3. 3Assertion: Equivalent weight of in the reaction, is while that of is 28/6. Reason : Equivalent weight2017Equivalence concept
  4. 4For which of the following elements it is difficult to disproportionate in +3 oxidation state?2016Types of redox reactions
  5. 5Substances that are oxidised and reduced in the following reaction are respectively2016Oxidation and Reduction Reactions
  6. 6Which of the following can be oxidised by ?2016Oxidation and Reduction Reactions
  7. 7What is the oxidation number of in ?2014Oxidation number
  8. 8Assertion: The correct order of oxidising power is : Reason: The oxidation state of is +7 .2014Oxidation number
  9. 9Which will not form precipitation after addition of in presence of ?2012Redox titration
  10. 10Predict the product of reaction of with in basic medium.2011Redox titration
  11. 11When reacts with in alkaline medium gives bromate ion. Then oxidation state of Mn changes from +7 to2011Redox titration
  12. 12How much amount of is required for liberation of of when titrated with ?2011Redox titration
  13. 13Assertion : Sulphur is oxidised by in presence of (III). Reason : Fe (III) oxidises sulphur to sulphate.2011Oxidation and Reduction Reactions
  14. 14Assertion : Chlorine undergoes disproportionation reaction in alkaline medium. Reason : is an oxidising agent.2011Types of redox reactions
  15. 15of the carbonate of a metal was treated with of . After the completion of the reaction, the solution was boiled off to expel and was then ti2009Equivalence concept
  16. 16Assertion : In an acid-base titration involving strong base and a weak acid, methyl orange can be used as an indicator. Reason : Methyl oran2009Redox titration
  17. 17Assertion : In the iodometric titration starch is used as an indicator. Reason : Starch is a polysaccharide.2006Redox titration
  18. 18In the balanced chemical reaction and respectively corresponds to2005Balancing of redox reactions
  19. 19For decolourization of 1 mole of , the moles of required is2004Oxidation and Reduction Reactions
  20. 20Oxidation state of in is2002Oxidation number
  21. 21Assertion : In some cases oxygen shows positive oxidation number though it is an electronegative element. Reason : Fluorine is more electron2001Oxidation number

Frequently Asked Questions

1.How many questions are available for Redox Reactions?

This chapter includes 21 questions compiled from AIIMS papers spanning 2001 to 2019.

2.Are these questions only from AIIMS, or from other exams too?

These are AIIMS questions specifically for the Redox Reactions chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

3.Is Redox Reactions an important chapter for AIIMS Chemistry?

Redox Reactions has appeared in 13 of the 19 years of AIIMS papers covered here, with 21 questions across 13 papers - about 2 per paper it appears in.

4.What is the difficulty level of Redox Reactions questions in AIIMS?

Of the 21 questions analysed for this chapter, 62% are easy, 19% moderate and 19% tough. 2011 had the most, with 5 questions.

5.Which topics in Redox Reactions should I focus on?

These topics have carried the most weightage in Redox Reactions:

  • Redox titration - 7 questions (33%)
  • Oxidation number - 5 questions (24%)
  • Oxidation and Reduction Reactions - 4 questions (19%)
  • Redox titration has produced the most tough questions (1).
6.Is Redox Reactions's weightage in AIIMS going up or down?

Across all 13 papers analysed, Redox Reactions has averaged about 1.6 questions per paper. In the last three years (2017–2019), that average has fallen, at about 0.6 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.