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Friday, 9 October

NEET UG 2018 · Chemistry · Question 46

NEET 2018 Chemistry, question 46

Question 46 of the NEET 2018 paper (code AA) is a Chemistry question from Redox Reactions. Its idea, Calculating Oxidation Numbers, was asked 4 times, in 2018, 2020, 2025 and 2026, across NEET 2017–2026. The CBSE official answer key gives option 3.

Updated 2026-10-08

Q46 · Chemistry

The correct order of N-compounds in its decreasing order of oxidation states is

  1. 1HNO3\mathrm{HNO_3}, NH4Cl\mathrm{NH_4Cl}, NO, N2\mathrm{N_2}
  2. 2HNO3\mathrm{HNO_3}, NO, NH4Cl\mathrm{NH_4Cl}, N2\mathrm{N_2}
  3. 3HNO3\mathrm{HNO_3}, NO, N2\mathrm{N_2}, NH4Cl\mathrm{NH_4Cl}Official answer
  4. 4NH4Cl\mathrm{NH_4Cl}, N2\mathrm{N_2}, NO, HNO3\mathrm{HNO_3}

Official answer: option 3 · CBSE official answer key

Same idea

Calculating Oxidation Numbers, in other papers

NEET asked this idea 4 times, in 2018, 2020, 2025 and 2026. The other 3 questions below.

  • 2026 Q81The correct decreasing order of oxidation state of the underlined atom in each molecule isOne-line MCQ · Medium
  • 2025 Q55Consider the following compounds : K‾O2\underline{K}O_2, H2O‾2H_2\underline{O}_2 and H2S‾O4H_2\underline{S}O_4 The oxidation states of the…One-line MCQ · Easy
  • 2020 Q125What is the change in oxidation number of carbon in the following reaction ? CH4(g)+4Cl2(g)→CCl4(l)+4HCl(g)\mathrm{CH_4(g) + 4Cl_2(g) \to CCl_4(l) + 4HCl(g)}One-line MCQ · Easy

Calculating Oxidation Numbers: 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