Identify the process in which the change in the oxidation state is $5$:

  • A
    $C_{2}O_{4}^{2-} \rightarrow 2CO_{2}$
  • B
    $CrO_{4}^{2-} \rightarrow Cr^{3+}$
  • C
    $Cr_{2}O_{7}^{2-} \rightarrow 2Cr^{3+}$
  • D
    $MnO_{4}^{-} \rightarrow Mn^{2+}$

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In the chromyl chloride test for the confirmation of $Cl^{-}$ ion,a yellow solution is obtained. Acidification of the solution and the addition of amyl alcohol and $10\% H_2O_2$ turns the organic layer blue,indicating the formation of chromium pentoxide. The oxidation state of chromium in that compound is:

Match the items in Column-$I$ with relevant items in Column-$II$.
Column-$I$ Column-$II$
$A$. Positively charged ion $1$. $+7$
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$D$. Oxidation number of fluorine in $NaF$ $4$. $0$
$E$. Negatively charged ion $5$. Cation
$6$. Anion

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