Single Choice

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

A$$K_2SO_4$$.$$Cr_2(SO_4)_3.24H_2O$$ (Chromealum)
B$$PbCrO_4$$ (Chromite yellow)
C$$FeCr_2O_4$$ (Chromite)
Correct Answer
D$$PbCrO_4.PbO$$ (Chrome red)

Solution

Following step reactions are involved in preparation of $$K_2Cr_2O_7$$ from Chromite ore (Fe$$Cr_2O_4$$)
(i)4$$FeCr_2O_4$$ + 4$$Na_2CO_3$$ +9$$O_2$$ $$\rightarrow$$ $$8NaCrO_4$$ +$$2Fe_2O_3$$ +$$4CO_2$$ (chromite ore).
(ii)$$2Na_2CrO_4$$ +$$H_2SO_4$$ $$\rightarrow$$ $$Na_2Cr_2O_7$$ +$$Na_2SO_4$$ +$$H_2O$$
(iii) $$2Na_2Cr_2O_7$$ +$$2KCl$$ $$\rightarrow$$ $$2K_2Cr_2O_7$$ +$$2NaCl$$

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