9. Explain the method of preparation of K2 Cr2O7
from iron chromite.
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Answer:
The preparation of potassium dichromate from chromite involves the following main steps:
Explanation:
(i) The chromate ore is finely ground and heated strongly with molten alkali in the presence of air.
(ii) The solution of sodium chromate is filtered and acidified with dilute sulphuric acid so that sodium dichromate is obtained.
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