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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_2 SO_4 ,Cr_2 (SO_4)_3 . 24 H_2O` ( chrome alum)

B

`PbCrO_4` ( chome yellow)

C

`FeCr_2 O_4` ( chromite)

D

`PbCrO_4 PbO` ( chrome red)

Text Solution

Verified by Experts

The correct Answer is:
C
` 4 Fe O , Cr_2 O_(3) + 8 Na_2 CO_3 + 7O_2 to 8 Na_2 CrO_4 CrO_4 + 2 Fe _2 O_(3) + 8 CO_2`
` 2 Na_2 CrO_(4) + con. H_2 SO_(4) to Na_2 Cr_2 O_(7) + Na_2 SO_4 +H_2 O`
` Na_2 Cr_2 O_(7) + KCl to K_2 Cr_2 O_(7) + 2NaCl`
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