Skip to content
doubtly
Sign up
Log in to upvote 0 Log in to downvote
Topic: Trends: ionization enthalpy, oxidation states, atomic radii· d- and f-Block Elements

Identify the incorrect statement.

1. Cr\(^{2+}\)(d\(^4\)) is a stronger reducing agent than Fe\(^{2+}\)(d\(^6\)) in water.

2. The 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. Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.

4. The oxidation states of chromium in CrO\(_4^{2-}\) and Cr\(_2\)O\(_7^{2-}\) are not the same.

Doubtly Asked NEET UG 2020 Practice test neet Save WhatsApp Report
Sign in to comment

1 answer

Log in to upvote 0 Log in to downvote

Best answer

Answer: 4. The oxidation states of chromium in CrO\(_4^{2-}\) and Cr\(_2\)O\(_7^{2-}\) are not the same.

Check each statement.

  • (1) \(\mathrm{Cr^{3+}}\) (half-filled \(t_{2g}^3\)) is very stable, so \(\mathrm{Cr^{2+}}\) readily oxidises; it is a stronger reductant than \(\mathrm{Fe^{2+}}\). Correct.
  • (2) Catalytic activity of transition metals is due to variable oxidation states and complex formation. Correct.
  • (3) Interstitial compounds are formed by small atoms (H, C, N) in lattice voids. Correct.
  • (4) Chromium is +6 in both \(\mathrm{CrO_4^{2-}}\) and \(\mathrm{Cr_2O_7^{2-}}\), so they are the same. The statement is wrong.

Answer: option (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
Was this answer helpful?
Sign in to comment

Your answer

Log in or create a free account to answer this question.