In acidic medium, K 2 Cr 2 O 7 shows oxidising action as represented in the half reaction Cr 2 O 7 2- + XH + + Ye - rightarrow 2 A + ZH 2 O X , Y , Z and A are respectively are:

Chemistry · Redox Reactions

JEE Main 2024 — 1 February, Shift 1 — Question 59

In acidic medium, $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ shows oxidising action as represented in the half reaction

$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{-} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_{2} \mathrm{O}$ $\mathrm{X}, \mathrm{Y}, \mathrm{Z}$ and A are respectively are:

Option A:
$8,6,4$ and $\mathrm{Cr}_{2} \mathrm{O}_{3}$
Option B:
14, 7, 6 and $\mathrm{Cr}^{3+}$
Option C:
$8,4,6$ and $\mathrm{Cr}_{2} \mathrm{O}_{3}$
Option D:
$14,6,7$ and $\mathrm{Cr}^{3+}$
Correct

Answer: D

Step-by-step solution

The balanced reaction is,

$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_{2} \mathrm{O}$

$\mathrm{X}=14$

$\mathrm{Y}=6$

$\mathrm{A}=7$

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Exam: JEE Main 2024
Paper: 1 February, Shift 1
Subject: Chemistry
Chapter: Redox Reactions
Topic: Types of Redox Reactions & Balancing of Redox Reactions

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