Which of the following species exists?

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(A) $1$. $AlF_6^{3-}$ exists because $Al$ can expand its octet due to the presence of vacant $3d$ orbitals,and the small size of $F^-$ ions allows six

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$AlF_6^{3-}$

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(A) $1$. $AlF_6^{3-}$ exists because $Al$ can expand its octet due to the presence of vacant $3d$ orbitals,and the small size of $F^-$ ions allows six of them to coordinate around the $Al^{3+}$ ion.$2$. $MnF_7$ does not exist because $Mn$ cannot accommodate seven large $F$ atoms due to steric hindrance and the high oxidation state required.$3$. $BI_4^-$ does not exist because $B$ is a small atom and cannot accommodate four large $I$ atoms around it due to severe steric hindrance.$4$. $SCl_6$ does not exist because $S$ is not large enough to accommodate six large $Cl$ atoms around it due to steric hindrance,unlike $SF_6$ where $F$ is small.

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