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Q.

Identify the incorrect statement

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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.

answer is C.

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Detailed Solution

CrO42−                Cr2O72-X−8=−2    2X−14=−2X=6               X=6
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