Write the balanced equations in the manufacture of $K_{2} C r_{2} O_{7}$ from Chromite Ore.

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Solution

The balanced equations in the manufacture of $K_{2} C r_{2} O_{7}$ from chromite ore are as given below.
Step I : roasting- conversion of $c h r o m i t e$ ore into $s o d i u m$ $c h r o m a t e$
$4 F e O \cdot C r_{2} O_{3} + 8 N a_{2} C O_{3} + 7 O_{2} \to 2 F e_{2} O_{3} + 8 N a_{2} C r O_{4} + 8 C O_{2}$
Step II : Conversion of $s o d i u m$ $c h r o m a t e$ into $s o d i u m$ $d i c h r o m a t e$
$2 N a_{2} C r O_{4} + H_{2} S O_{4} \to N a_{2} C r_{2} O_{7} + N a_{2} S O_{4} + H_{2} O$
Step III : Conversion of $s o d i u m$ $d i c h r o m a t e$ into $p o t a s s i u m$ $d i c h r o m a t e$
$N a_{2} C r_{2} O_{7} + 2 K C l \to K_{2} C r_{2} O_{7} + 2 N a C l$

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