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

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(i) 4FeCr2O4 + 8Na2CO3 +7O2 8Na2CrO4 + 2Fe2O3 + 8CO2 

(ii) 2Na2CrO4 + (conc.) H2SO4 Na2Cr2O7 + Na2SO4 + H2

(iii) Na2Cr2O4 + 2KCl → K2Cr2O7 + 2NaCl. 

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