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

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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.