Which of the following statements about BF_4^ | vedclass

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(D) In $BF_4^{-}$,the oxidation state of $B$ is $+3$. In $AlF_6^{3-}$,the oxidation state of $Al$ is $+3$. Thus,statement $(i)$ is incorrect.In $BF_4^

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$(ii)$,$(iii)$

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(D) In $BF_4^{-}$,the oxidation state of $B$ is $+3$. In $AlF_6^{3-}$,the oxidation state of $Al$ is $+3$. Thus,statement $(i)$ is incorrect.In $BF_4^{-}$,the covalency of $B$ is $4$. In $AlF_6^{3-}$,the covalency of $Al$ is $6$. Thus,statement $(ii)$ is correct.In $BF_4^{-}$,$B$ is surrounded by $4$ bonds,meaning $8$ electrons in its valence shell,so it obeys the octet rule. Thus,statement $(iii)$ is correct.$B$ and $Al$ do not have a diagonal relationship; $B$ has a diagonal relationship with $Si$. Thus,statement $(iv)$ is incorrect.Therefore,statements $(ii)$ and $(iii)$ are correct.

Which of the following statements about $BF_4^{-}$ and $AlF_6^{3-}$ are correct?
$(i)$ $B$ and $Al$ differ in their oxidation states.
$(ii)$ $B$ and $Al$ differ in their covalency.
$(iii)$ $B$ obeys the octet rule.
$(iv)$ $B$ and $Al$ are in diagonal relationship.

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Which of the following statements about $BF_4^{-}$ and $AlF_6^{3-}$ are correct?$(i)$ $B$ and $Al$ differ in their oxidation states.$(ii)$ $B$ and $Al$ differ in their covalency.$(iii)$ $B$ obeys the octet rule.$(iv)$ $B$ and $Al$ are in diagonal relationship.