(A) The structures are as follows:$NO_2^+$: $[O=N=O]^+$$NCO^-$: $[N \equiv C-O]^-$$CS_2$: $S=C=S$In $CS_2$,the central carbon atom is $sp$-hybridised,

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(A) The structures are as follows:$NO_2^+$: $[O=N=O]^+$$NCO^-$: $[N \equiv C-O]^-$$CS_2$: $S=C=S$In $CS_2$,the central carbon atom is $sp$-hybridised,resulting in a linear geometry.$NCO^-$ and $NO_2^+$ are isoelectronic with $CS_2$ (each having $16$ valence electrons),and they also exhibit a linear geometry.