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Write the balanced equation in the manuf...

Write the balanced equation in the manufacture of `K_2Cr_2O_7` from chromite ore

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From chromate ore `k_(2)Cr_(2)O_(7)` is manufactured in three steps.
Step 1 : `4FeCr_(2)O_(3)+8Na_(2)CO_(3)+7O_(2)rarr 8Na_(2)CrO_(4)+2Fe_(2)O_(3)+8CO_(2)`
Step 2 : `2Na_(2)CrO_(4)+2H^(+)rarr NO_(2)Cr_(2)O_(7)+2Na^(+)+H_(2)O`
Step 3 : `Na_(2)Cr_(2)O_(7)+2KCl rarr K_(2)Cr_(2)O_(7)+2NaCl`
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