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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 lattice of metals
c
The oxidation states of chromium in CrO42- and Cr2O72- are not the same
d
Cr2+d4 is a stronger reducing agent than Fe2+d6 in water.