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Which of the following compounds is used as a starting, material for the preparation of potassium dichromate ?

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K₂SO₄.Cr₂(SO₄)₃.24H₂O (chrome alum)

PbCrO₄ (Chrome yellow)

FeCr₂O₄(Chromite)

PbCrO₄.PbO (Chrome red)

answer is C.

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Detailed Solution

Potassium dichromate, (K₂Cr₂O₇) is an orange-red inorganic chemical reagent. In different laboratory or industry.

It can be prepared through the following process:

o Initially the fusion of chromite ore FeCr₂O₄ with sodium or potassium carbonate in the presence of access of air.

4FeCr₂O₄ + 8Na₂CO₃ + 7O₂ --> 8Na₂CrO₄ + 2FeO₃ + 8CO₂

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