What is the change in the oxidation state of $Mn$ in the reaction of $MnO_4^{-}$ with $H_2O_2$ in acidic medium?

  • A
    $7 \rightarrow 4$
  • B
    $6 \rightarrow 4$
  • C
    $7 \rightarrow 2$
  • D
    $6 \rightarrow 2$

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What is the oxidation number of $Cl$ in $HClO_4$ and $HClO_3$?

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Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?

The oxidation number of iodine varies from:

Match the Column-$I$ with Column-$II$ for the oxidation states of the central atoms.
Column-$I$ Column-$II$
$A$. $Cr_2O_7^{2-}$ $1$. $+3$
$B$. $MnO_4^{-}$ $2$. $+4$
$C$. $VO_3^{-}$ $3$. $+5$
$D$. $FeF_6^{3-}$ $4$. $+6$
$5$. $+7$

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