1.

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

Answer»

Solution :If pH of potassium dichromate in increased it is converted to yellow potassium chromate.
`UNDERSET("(yellow)")(2CrO_(4(aq))^(2-)) + 2H_((aq))^(+) rarr underset(("ORANGE"))(Cr_(2)O_(7(aq))^(2-)) + H_(2)O_((l))`
`underset(("orange"))(Cr_(2)O_(7(aq))^(2-)) + 2OH_((aq))^(-) rarr underset(("yellow"))(2CrO_(4)^(2-)) + H_(2)O`


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