Question

Q. Identify the incorrect statement.
A $\mathrm{Cr}^{2+}\left(d^{4}\right)$ is a stronger reducing agent than $\mathrm{Fe}^{2+}\left(d^{6}\right)$ in water.
B 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.
c Interstitial compounds are those that are formed when small atoms like $\mathrm{H}, \mathrm{C}$ or $\mathrm{N}$ are trapped inside the crystal lattices of metals.
(D) The oxidation states of chromium in $\mathrm{CrO}_{4}^{2-}$ and $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$

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