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a
Oxidation state of ‘Cr’ in CrO4-2 and Cr2O7-2 is same
b
Interstitial compounds are stoichiometric compounds formed when small atoms like H, C, B, N are trapped in the lattice of transition elements
c
Catalytic activity of transition metals is due to their ability to exhibit multiple (variable) oxidation states and to form complexes
d
CoF3 is stable due high lattice energy whereas VF5 is stable due to high bond dissociation enthalpy
answer is B.
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