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(A, C, D) $1$. $[Cu(CN)_4]^{3-}$: $Cu^+$ is $3d^{10}$. It forms a tetrahedral complex with $sp^3$ hybridization. This statement is correct.$2$. $[Ni(C

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$[ZnBr_4]^{2-}$ is tetrahedral and diamagnetic.

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(A, C, D) $1$. $[Cu(CN)_4]^{3-}$: $Cu^+$ is $3d^{10}$. It forms a tetrahedral complex with $sp^3$ hybridization. This statement is correct.$2$. $[Ni(CN)_6]^{4-}$: $Ni^{2+}$ is $3d^8$. It cannot form a $d^2sp^3$ complex as it lacks sufficient empty $d$-orbitals. This is incorrect.$3$. $[ZnBr_4]^{2-}$: $Zn^{2+}$ is $3d^{10}$. It forms a tetrahedral complex with $sp^3$ hybridization and is diamagnetic. This statement is correct.$4$. $[Cr(NH_3)_6]^{3+}$: $Cr^{3+}$ is $3d^3$. It forms an octahedral complex with $d^2sp^3$ hybridization. This statement is correct.Note: Multiple options ($A$,$C$,and $D$) are chemically correct based on standard coordination chemistry principles.

Point out the correct statements amongst the following.

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