# NEET Chemistry The p-Block Elements (XII) Questions Solved

Which of the following polyhalide ion is most stable

(A) $B{r}_{3}^{-}$

(B) ${I}_{3}^{-}$

(C) $C{l}_{3}^{-}$

(D) ${F}_{3}^{-}$

The stability decrease in the order ${I}_{3}^{-}$ > $B{r}_{3}^{-}$ > $C{l}_{3}^{-}$ > ${F}_{3}^{-}$

In fact no ${F}_{3}^{-}$ compounds are known,because flourine has no available d-orbitals and therefore can not expand its octet.

Difficulty Level:

• 4%
• 59%
• 13%
• 27%