1.

How is potassium dichromate prepared from the chromite ore?

Answer»

The manufacture of K2Cr2O7 from chromite ore involves is steps. 

Step-1: 4FeCr2O4 + 8Na2CO3 + 7O2 → 8Na2CrO4 + 2FerO3 + 8CO2 

Step-2: 2Na2CrO4 + 2H+ → Na2Cr2O7 + 2Na+ + H2

Step-3: Na2Cr2O7 + 2KCl → K2Cr2O7 + 2NaCl



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