NEET · Chemistry · STD 12 - 4. d and f- block elements

Identify the incorrect statement.

A The oxidation states of chromium in \(CrO _{4}\,^{2-}\) and \(Cr _{2} O _{7}\,^{2-}\) are not the same
B \(Cr ^{2+}\left( d ^{4}\right)\) is a stronger reducing agent than \(Fe ^{2+}\left( d ^{6}\right)\) in water.
C 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.
D Interstitial compounds are those that are formed when small atoms like \(H , C\) or \(N\) are trapped inside the crystal lattices of metals.

Verified Solution

Answer & Solution

Correct Answer

(A) The oxidation states of chromium in \(CrO _{4}\,^{2-}\) and \(Cr _{2} O _{7}\,^{2-}\) are not the same

Step-by-step Solution

Detailed explanation

Chromate \(\left( CrO _{4}\,^{-2}\right) \Rightarrow\) oxidation state \(=+6\) dichromate \(\left( Cr _{2} O _{7}\,^{-2}\right) \Rightarrow\) oxidation state \(=+6\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From NEET

Explore more questions on app