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Friday, 9 October

NEET UG 2020 · Chemistry · Question 126

NEET 2020 Chemistry, question 126

Question 126 of the NEET 2020 paper (code E1) is a Chemistry question from The d- and f-Block Elements. Its idea, Cr(II) Reducing Power and Interstitial Compounds, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.

Updated 2026-10-08

Q126 · Chemistry

Identify the incorrect statement.

  1. 1Cr2+\mathrm{Cr^{2+}}(d4d^4) is a stronger reducing agent than Fe2+\mathrm{Fe^{2+}}(d6d^6) in water.
  2. 2The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
  3. 3Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
  4. 4The oxidation states of chromium in CrO42−\mathrm{CrO_4^{2-}} and Cr2O72−\mathrm{Cr_2O_7^{2-}} are not the same.Official answer

Official answer: option 4 · NTA final answer key

Same idea

The only question on Cr(II) Reducing Power and Interstitial Compounds

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

Cr(II) Reducing Power and Interstitial Compounds: every question and how it was framed

The chapter

The d- and f-Block Elements in ten years of NEET

21 questions from 2017–2026, asked in 10 of 10 papers, about 2.0 a paper. d- and f-Block Elements alone had 21.

Chapter analysisStudy this chapterPractise this chapter

The d- and f-Block Elements: questions per paper

0242’172’181’192’202’212’222’233’242’253’26