1.

Write reactions involved in preparation of potassium dichromate from chrome iron ore.

Answer»

Reactions involved in the preparation of potassium dichromate from chrome iron ore (chromite ore):

a. Conversion of chrome iron ore into sodium chromate (Roasting): 

4FeO.Cr2O3 (Chrome iron ore) + 8Na2CO3 (Sodium carbonate) + 7O2 (Oxygen) → 2Fe2O3 (Ferric oxide) + 8Na2CrO4 (Sodium chromate) + 8CO2 (Carbon dioxide)

b. Conversion of sodium chromate into sodium dichromate:

2Na2CrO4 (Sodium chromate) + H2SO4 (conc.) → Na2Cr2O7 (Sodium dichromate)+ Na2SO4 (Sodium sulphate) + H2O

c. Conversion of sodium dichromate into potassium dichromate:

Na2Cr2O7 (Sodium dichromate) + 2KCl (Potassium chloride) → K2Cr2O7 (Potassium dichromate) + 2NaCl (Sodium chloride)



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