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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn208

Select ALL anions that are named correctly AND have the central metal in the +6 state (O = $- 2$ ).

A $CrO X_{4} X^{2 -}$ , chromate
B $MnO X_{4} X^{2 -}$ , manganate
C $Cr X_{2} O X_{7} X^{2 -}$ , dichromate
D $MnO X_{4} X^{-}$ , manganate

Answer: A, B, C

CrO X_{4} X^{2 -}

: Cr = +6.

MnO X_{4} X^{2 -}

: Mn = +6.

Cr X_{2} O X_{7} X^{2 -}

: Cr = +6.

MnO X_{4} X^{-}

has Mn = +7 and is permanganate, not manganate.

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