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  • Hydrogen peroxide oxidises <img alt="\mathrm{\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-} to \left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cm

Hydrogen peroxide oxidises \mathrm{\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-} to \left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}} in acidic medium but reduces \mathrm{\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}to\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}} in alkaline medium. The other product formed are -
 

Option: 1

\mathrm{H}_2 \mathrm{O}+\mathrm{O}_2, \mathrm{H}_2 \mathrm{O}
 


Option: 2

\mathrm{H}_2 \mathrm{O}+\mathrm{O_2}, \mathrm{H}_2 \mathrm{O}+\mathrm{OH}^{-}
 


Option: 3

\mathrm{H}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O}
 


Option: 4

\mathrm{H}_2 \mathrm{O}, \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2


Answers (1)

best_answer

(i) In acidic medium,

\left[\mathrm{Fe}^{2+}(\mathrm{CN})_6\right]^{4-}+\mathrm{H}_2 \mathrm{O}_2^{-1}+2 \mathrm{H}^{+} \longrightarrow\left[\mathrm{Fe}^{3+}(\mathrm{CN})_6\right]^{3-}+2 \mathrm{H}_2 \mathrm{O}^{-2}

(ii) In alkaline medium,

\left[\mathrm{Fe}^{3+}(\mathrm{CN})_6\right]^{3-}+\mathrm{H}_2 \mathrm{O}_2^{-1}+2 \mathrm{OH}^{-} \longrightarrow\left[\mathrm{Fe}^{2+}(\mathrm{CN})_6\right]^{4-}+\mathrm{O_2}+2 \mathrm{H}_2 \mathrm{O}

Hence, \mathrm{H}_2 \mathrm{O}$ and $\mathrm{O_2} +\mathrm{H}_2 \mathrm{O} are byproducts.

Hence option 4 is correct.

Posted by

manish painkra

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