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Redox Reactions — NEET Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

How is oxidation defined in terms of electron transfer?
  1. Loss of electrons by a species ✓
  2. Gain of electrons by a species
  3. Acceptance of a proton by a species
  4. Sharing of an electron pair between species
Answer: A. Oxidation is electron loss and reduction is electron gain; the two occur simultaneously because released electrons must be accepted. The oxidised species is therefore the electron donor.
Why not B: Gain of electrons is reduction, remembered by the complementary half-reaction.
Why not C: Proton acceptance defines Brønsted basicity rather than oxidation.
Why not D: Electron-pair sharing describes covalent bond formation and need not change oxidation states.
What is the oxidation number of sulphur in H2SO4?
  1. +4
  2. -6
  3. +6 ✓
  4. +8
Answer: C. 2(+1) + S + 4(−2) = 0, so S = +6. The +4 trap commonly comes from counting only three of the four oxygen atoms.
Why not A: +4 belongs to sulphur in SO2 or sulphite and results here from omitting one oxygen contribution.
Why not B: This assigns the balancing magnitude the wrong sign.
Why not D: This cancels hydrogen but treats each oxygen as contributing only −1.
Which coefficient set balances MnO4- + Fe2+ + H+ → Mn2+ + Fe3+ + H2O in acidic medium, in that order?
  1. 1, 5, 8, 1, 5, 4 ✓
  2. 1, 1, 8, 1, 1, 4
  3. 2, 5, 16, 2, 5, 8
  4. 1, 5, 4, 1, 5, 2
Answer: A. The reduction half uses 5e− and 8H+: MnO4− + 8H+ + 5e− → Mn2+ + 4H2O. Adding five Fe2+ → Fe3+ + e− gives coefficients 1,5,8,1,5,4.
Why not B: This balances atoms other than charge but fails to supply five Fe2+ for permanganate's five-electron reduction.
Why not C: Doubling only the permanganate, acid and water coefficients leaves iron and charge unbalanced.
Why not D: Four H+ and two waters leave oxygen and hydrogen short by two each.

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Other NEET Chemistry chapters

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Questions

How many NEET questions are there on Redox Reactions?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.