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Q.

Which one of the following statement is not true

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a

Beyond Mn in 3d series , only Fe and Co form trihalides

b

MnO3F is the compound in which oxidation state of Mn is ‘+7’

c

The highest oxidation state of Cr in its halides is four

d

Fluorine stabilizes the higher oxidation states of transition metals as it is most electronegative element and also a strong oxidant.

answer is C.

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Detailed Solution

Oxidation state of Cr is highest in its hexa fluorides(CrF6)
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