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  • Explain the method of preparation of sodium dichromate from chromite ore. Give the equation representing oxidation of ferrous salts by dichromate ion.       <div styl

Explain the method of preparation of sodium dichromate from chromite ore. Give the equation representing oxidation of ferrous salts by dichromate ion.

 

 

 

 
 
 
 
 

Answers (1)

Preperation of sodium dichromate from chromite ore.

\underset{(chromite ore)}{4Fe\; Cr_{2}\; O_{4}}+8\; Na_{2}CO_{3}+7\; O_{2}
                                \downarrow

8Na_{2}CrO_{4}+2Fe_{2}O_{3}+8CO_{2}
 

2Na_{2}CrO_{4}+H_{2}SO_{4}\rightarrow Na_{2}Cr_{2}O_{7}+Na_{2}SO_{4}+H_{2}O

Oxidation of ferrous salts by dichromate ion.

Cr_{2}O_{7}^{2-}+6Fe^{2+}+14H^{+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_{2}O

Posted by

Sumit Saini

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