1.

How is K_(2)Cr_(2)O_(7) manufactured from chromite ore.

Answer»

SOLUTION :(i) Chromite ore in to sodium chromate .
`4FeO Cr_2O_3 + 8 Na_2 CO_3 + 7O_2 overset(DELTA)(RARR)2Fe_2O_3 + 8Na_2CrO_4 + 8 CO_2`
(ii) Sodium chromate in to sodium DICHROMATE.
`2Na_2CrO_4 + H_2SO_4 to Na_2Cr_2O_7 + Na_2SO_4 + H_2O`
(iii) Sodium dichromate in to potassium dichromate
`Na_2Cr_2O_7 + 2KCl to K_2Cr_2O_7 + 2NaCl`


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