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Which of the following compounds is used...

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

A

`K_2SO_4 Cr_3(SO_4)_3 24H_2O("Chrome alum ")`

B

`PbCrO_4(" Chrome yellow")`

C

`FeCr_2O_4 (chromite)`

D

`PbCrO_4PbO ("Chrome red")`

Text Solution

Verified by Experts

The correct Answer is:
C
`4FeO. Cr_2 O_3 + 8Na_2 CO_3 + 7O_2 to 8Na_2 CrO_4 + 2Fe_2 O_3 + 8CO_2`
`2Na_2CrO_4 + con. H_2SO_4 to Na_2 Cr_2 O_7 + Na_2SO_4 + H_2O`
`Na_2 Cr_2 O_7 + 2KCI to K_2Cr_2 O_7 + 2NaCl`
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