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  4. In the following redox reaction, Cr 2 O 72-+ Fe 2+ arrow Fe 3++ Cr 3+ 1 mole of Cr 2 O 72- oxidises

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Q. In the following redox reaction,
$Cr _2 O _7^{2-}+ Fe ^{2+} \rightarrow Fe ^{3+}+ Cr ^{3+} 1$ mole of $Cr _2 O _7^{2-}$ oxidises

General Principles and Processes of Isolation of Elements

Solution:

$Cr _2 O _7^{2-}+ Fe ^{2+} \rightarrow Fe ^{3+}+ Cr ^{3+}$
image
$Cr$-atoms
Change in $O.N.] 6$ units
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Change in $O.N.] 1 $ unit
By cross-multiplication
$Cr _2 O _7^{2-}+6 Fe ^{2+} \rightarrow 6 Fe ^{3+}+2 Cr ^{3+}$
$1 \,mol\, Cr _2 O _7^{2-}=6 \,mol\, Fe { }^{2+}$