Chemistry, asked by ringchamsinliupamai, 9 months ago

preparation of k2cr2o7 from chromite ore​

Answers

Answered by rakshithan702
0

Explanation:

(i)Potassium dichromate is prepared from chromate ore by

4FeCrO4 + 16NaOH +7O2 –> 8NaCrO4 + 2Fe2O3 + 8H2O

Thus formed sodium chromate into sodium dichromate

2Na2CrO4 + conc H2SO4 –> Na2Cr207 + Na2SO4 + H2O

(ii) Potassium permanganate can be prepared from pyrolusite(MnO2)

2MnO2 + 4KOH +O2 –> 2K2MnO4 + 2H2O

thus obtained product can be extracted with water and then oxidized electrolytically

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