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Question

Write down the reaction involved in preparation of Potassium dichromate from chromine ore.

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Solution

Following step reactions are involved in preparation of K2Cr2O7 from Chromite ore (FeCr2O4)
I. Formation of Na2CrO4 (sodium chromate)
4FeCr2O4+16NaOH+7O28Na2CrO4+2Fe2O3+8H2O
II. Conversion of Na2CrO4 to Na2Cr2O7
2Na2CrO4 +conc.H2SO4 Na2Cr2O7 + Na2SO4 H2O
III. Conversion of Na2Cr2O7 to K2Cr2O7
Na2Cr2O7 +2KCl K2Cr2O7 +2 NaCl.
Since the solubility of KCl is less than NaCl, so, K2Cr2O7 is obtained in form of orange crystals and the former can be removed by filtration.

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