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Write the steps involved in the preparation of K2Cr2O7 from chromite ore

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Write the steps involved in the preparation of K2Cr2O7 from chromite ore

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(i) It takes place in three steps:

Conversion of chromite ore into sodium chromate

4FeCr2O4 + 4Na2CO3 + 7O2  → Na2CrO4 + Fe2O3 + 8CO2

Conversion of sodium chromate into sodium dichromate

2Na2CrO4 + 2H+ →  Na2Cr2O7 + 2Na+ + H2O

Conversion of sodium dichromate into potassium dichromate

Na2Cr2O7 + 2KCl → K2 Cr2O7 + 2NaCl

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