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| कॉलम-$I$ | कॉलम-$II$ |
| $A$. $C_2O_4^{2-} \rightarrow 2CO_2$ | $P$. $2$ |
| $B$. $Cr_2O_7^{2-} + 14H^{+} \rightarrow 2Cr^{3+}$ | $Q$. $6$ |
| $C$. $2Na_2S_2O_3 \rightarrow Na_2S_4O_6$ | $R$. $3$ |
| $D$. $MnO_4^{-} \rightarrow MnO_2$ | $S$. $1$ |
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