Chemistry - Complete P-block Question with Solution | TestHub

The ions that are not cyclic are (A) $P_5{O}_{16}^{{⁷}^{-}}$ and (B) $P_4{O}_{13}^{{⁶}^{-}}$.

Linear polyphosphates follow the general formula $[P_n{O}_{3n+1}{]}^{(n+2)-}$, which matches options (A) and (B).

Cyclic metaphosphates follow the formula $[P_n{O}_{3n}{]}^{n-}$, which matches options (C) $P_5{O}_{15}^{{⁵}^{-}}$ and (D) $P_4{O}_{12}^{{⁴}^{-}}$.

Since (A) and (B) represent open-chain structures rather than rings, they are the correct non-cyclic choices.