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2K+CrO7^-2=K2CR2O7
In three Steps we can Produce K2Cr2O7
Step -1
4Fe Cr2O4 + 8Na2CO3 + 7O2 --> * Na2CrO4 + 2Fe2O3 + 8 CO2
Step - 2
2Na2CrO4 + H2SO4 --> Na2Cr2O7 + Na2SO4 + H2O
Step - 3
Na2Cr2O7 + 2KCl --> K2Cr2O7 + 2NaCl
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