Identify the incorrect statement

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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

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

The oxidation states of chromium in ${CrO}_{4}^{2 -}$ and ${Cr}_{2} O_{7}^{2 -}$ are not the same

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

answer is C.

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Detailed Solution

Chromate $(C r {O_{4}}^{- 2})$ oxidation state= +6
Dichromate $(C r_{2} {O_{7}}^{- 2})$ oxidation state= +6
Oxidation states are same.
(1) Reduction potential ${Cr}^{+ 2} / Cr > {Fe}^{+ 3} / {Fe}^{+ 2}$

(2) The transition metals and their compounds are known for their catalytic activity because they have the ability to
adopt multiple oxidation states; they have variable oxidation state giving unstable intermediates, and can form complexes.
(3) Interstitial compounds are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals. They
are usually non-stoichiometric and are neither typically ionic nor covalent.

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