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JEE Main 202116 MarchEvening Shift

Exam: JEE Main
Year: 2021
Date: 16 March
Shift: Evening Shift
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2021 · 16 March · Evening Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Fex _ 2 and Fey _ 3 are known when x and y are :

{Fex}_{2}

and

{Fey}_{3}

are known when

x

and

y

are :

Options

A $x = F, Cl, Br, I$ and $y = F, Cl, Br$
B $x = F, Cl, Br$ and $y = F, Cl, Br, I$
C $x = Cl, Br, I$ and $y = F, Cl, Br, I$
D $x = F, Cl, Br, I$ and $y = F, Cl, Br, I$

Correct answer

A. $x = F, Cl, Br, I$ and $y = F, Cl, Br$

Step-by-step solution

$\mathop{2{FeI}_{3}}_{\left(Unstable\right)} ⟶ \mathop{2{FeI}_{2}}_{\left(Stable\right)} + {I}_{2}$

Due to strong reducing nature of ${I}^{-}$

$2{Fe}^{3 +} + 2{I}^{-} ⟶ 2{Fe}^{2 +} + {I}_{2}$ remaining halides of ${Fe}^{2 +}$ and ${Fe}^{3 +}$ are stable.

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