KVPY SX SB Exam 19-Nov-2017 Question Paper

Question : 104 of 120

Marks: +1, -0

The fusion of chromite ore

(FeCr_2O_4)

with

Na_2CO_3

in air gives a yellow solution upon addition of water. Subsequent treatment with

H_2SO_4

produces an orange solution. The yellow and orange colours, respectively, are due to the formation of

Solution:

8Na_2CO_3 + 4FeCr _2O _4+7O_2

\ { –––––▸ } {Na _2CrO_4 }↙{\yellow \colour }+ 2 Fe_2O_3 + 8 O_2

{2Na_2CrO_4}↙{\yellow }\ {––––––––▸}↖{2H^{+}}{Na_2 Cr_2O_7 }↙{\orange}

+ 2Na^{+} + H_2O

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