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NEET UG 2021 · Chemistry · Question 52

NEET 2021 Chemistry, question 52

Question 52 of the NEET 2021 paper (code O1) is a Chemistry question from Redox Reactions. Its idea, Types of Redox Reactions, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.

Updated 2026-10-08

Q52 · Chemistry

Which of the following reactions is the metal displacement reaction ? Choose the right option.

  1. 1Fe+2HCl→FeCl2+H2↑\mathrm{Fe + 2HCl \to FeCl_2 + H_2\uparrow}
  2. 22Pb(NO3)2→2PbO+4NO2+O2↑\mathrm{2Pb(NO_3)_2 \to 2PbO + 4NO_2 + O_2\uparrow}
  3. 32KClO3→Δ2KCl+3O2\mathrm{2KClO_3 \xrightarrow{\Delta} 2KCl + 3O_2}
  4. 4Cr2O3+2Al→ΔAl2O3+2Cr\mathrm{Cr_2O_3 + 2Al \xrightarrow{\Delta} Al_2O_3 + 2Cr}Official answer

Official answer: option 4 · NTA final answer key

Same idea

The only question on Types of Redox Reactions

No other NEET paper from 2017–2026 tested this exact idea.

Types of Redox Reactions: every question and how it was framed

The chapter

Redox Reactions in ten years of NEET

10 questions from 2017–2026, asked in 8 of 10 papers, about 1.0 a paper. Redox Reactions alone had 10.

Chapter analysisStudy this chapterPractise this chapter

Redox Reactions: questions per paper

0240’172’181’191’201’210’221’231’241’252’26