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Question

Which of the following compounds is used as the starting material for the preparation of potassium dichromate?
  1. K2SO4.Cr2(SO4)3.24H2O (Chromealum)
  2. PbCrO4 (Chromite yellow)
  3. FeCr2O4 (Chromite)
  4. PbCrO4.PbO (Chrome red)

A
K2SO4.Cr2(SO4)3.24H2O (Chromealum)
B
FeCr2O4 (Chromite)
C
PbCrO4 (Chromite yellow)
D
PbCrO4.PbO (Chrome red)
Solution
Verified by Toppr

Following step reactions are involved in preparation of K2Cr2O7 from Chromite ore (FeCr2O4)
(i)4FeCr2O4 + 4Na2CO3 +9O2 8NaCrO4 +2Fe2O3 +4CO2 (chromite ore).
(ii)2Na2CrO4 +H2SO4 Na2Cr2O7 +Na2SO4 +H2O
(iii) 2Na2Cr2O7 +2KCl 2K2Cr2O7 +2NaCl

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