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Identify the incorrect statement.
A
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.
B
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
C
The oxidation states of chromium in $CrO_4^{2-}$ and $Cr_2O_7^{2-}$ are not the same.
D
$Cr^{2+}$ ($d^4$) is a stronger reducing agent than $Fe^{2+}$ ($d^6$) in water.
Detailed Solution
The oxidation state of chromium is +6 in both $CrO_4^{2-}$ and $Cr_2O_7^{2-}$.
So the statement that they are not the same is incorrect.