JEE MAIN - Chemistry (2023 - 25th January Evening Shift - No. 13)
Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from :
+ 2 to + 1
+ 6 to + 2
+ 6 to + 3
+ 3 to + 1
Explanation
$\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ acts as a strong oxidising agent in acidic medium. During this process, oxidation state of $\mathrm{Cr}$ changes from $+6$ to $+3$.
$$ \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_{2} \mathrm{O} $$
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