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  • (a)    Write chemical equations involved in the preparation of from <img alt="\mathrm{MnO}_2" src="https://entrancecorner.codeco

(a)    Write chemical equations involved in the preparation of \mathrm{KMnO}_4 from \mathrm{MnO}_2.
(b)    Actinoids show a wide range of oxidation states. Why?

 

 

 

 
 
 
 
 

Answers (1)

(a)    Preparation of \mathrm{KMnO}_4 from \mathrm{MnO}_2.

        \begin{aligned} &2 \mathrm{MnO}_{2}+4 \mathrm{KoH}+\mathrm{O}_{2} \rightarrow 2 \mathrm{K}_{2} \mathrm{MnO}_{4}+2 \mathrm{H}_{2} \mathrm{O}\\ &3 \mathrm{M n O}_{4}^{2}+4 \mathrm{H}^{+} \rightarrow 2\mathrm{MnO}_{4}^{-}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \end{aligned}

(b)    Actinoids show wide range of oxidation states due to small energy difference between 5f, 6d and 7s subshells. They can show oxidation states of +3 and higher as well like +4, +5, +6 +7.

Posted by

Sumit Saini

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