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Write the equations involved in the prep...

Write the equations involved in the preparation of potassium dichromate from chromite ore.

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(i) Preparation of `K_2Cr_2O_7` from chromite ore
(a) Potassium dichromate is obtained by the fusion of chromite ore `(FeCr_2O_4)` with sodium ( or potassium) carbonate in the presence of excess of air.
`underset("Chromiteore")(4FeCr_2O_4+8Na_2CO_3+7O_2)tounderset("(Yellow solution)of Sodium chromite")(8Na_2CrO_4+2Fe_2O_3+8CO_2)`
The solution is filtered and treated with sulphuric acid
`Na_2CrO_4+H_2SO_4tounderset("Sodium dichromate")(Na_2Cr_2O_7+Na_2SO_4+H_2O)`
(c) Now sodium dichromate is treated with potassium chloride. As a result potassium dichromate is poduced
`Na_2Cr_2O_7+2KCltounderset(potassium dichromate crystal")(K_2Cr_2O_7+2NaCl)`
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(a) Give reasons for the following observations: (i) Cu^(+) ion is not stable in aqueous solution. (ii) Mn (II) ion shows maximum paramagnetic character amongst the bivalent ions of first transition series. (iii) Scandium (At. no. 21) salts are white. (b) Describe the reactions involved in the preparation of K_2Cr_2O_7 from chromite ore.