Redox Reactions Question 1
Question 1 - 2024 (01 Feb Shift 1)
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 $\mathrm{A}$ are respectively are:
(1) $8,6,4$ and $\mathrm{Cr}{2} \mathrm{O}{3}$
(2) $14,7,6$ and $\mathrm{Cr}^{3+}$
(3) $8,4,6$ and $\mathrm{Cr}{2} \mathrm{O}{3}$
(4) $14,6,7$ and $\mathrm{Cr}^{3+}$
Show Answer
Answer (4)
Solution
The balanced reaction is,
$\mathrm{Cr}{2} \mathrm{O}{7}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_{2} \mathrm{O}$
$\mathrm{X}=14$
$\mathrm{Y}=6$
$\mathrm{A}=7$
