JEE PYQ: P Block Elements Question 4
Question 4 - 2021 (16 Mar Shift 2)
$\text{FeX}_2$ and $\text{FeY}_3$ are known when x and y are:
(1) $x = \text{F, Cl, Br, I}$ and $y = \text{F, Cl, Br}$
(2) $x = \text{F, Cl, Br}$ and $y = \text{F, Cl, Br, I}$
(3) $x = \text{Cl, Br, I}$ and $y = \text{F, Cl, Br, I}$
(4) $x = \text{F, Cl, Br, I}$ and $y = \text{F, Cl, Br, I}$
Show Answer
Answer: (1)
Solution
$2\text{FeI}_3 \to 2\text{FeI}_2 + \text{I}_2$ (unstable to stable). Due to strong reducing nature of $\text{I}^-$: $2\text{Fe}^{3+} + 2\text{I}^- \to 2\text{Fe}^{2+} + \text{I}_2$. Remaining halides of $\text{Fe}^{2+}$ and $\text{Fe}^{3+}$ are stable.
BETA
