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  4. The fusion of chromite ore (FeCr2O4) with Na2CO3 in air gives a yellow solution upon addition of water. Subsequent treatment with H2SO4 produces an orange solution. The yellow and orange colours, respectively, are due to the formation of

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Q. The fusion of chromite ore $(FeCr_{2}O_{4})$ with $Na_{2}CO_{3}$ in air gives a yellow solution upon addition of water. Subsequent treatment with $H_{2}SO_{4}$ produces an orange solution. The yellow and orange colours, respectively, are due to the formation of

KVPYKVPY 2017The d-and f-Block Elements

Solution:

The fusion of chromite ore $\left( FeCr _{2} O _{4}\right)$ with $Na _{2} CO _{3}$ in air to produce $Na _{2} CrO _{4}$, a yellow coloured solution in aqueous solution. Subsequent treatment of, it with $H _{2} SO _{4}$ produces $Na _{2} Cr _{2} O _{7}$, which is orange coloured solution.
$8 Na _{2} CO _{3}+4 FeCr _{2} O _{4}+7 O _{2} \longrightarrow $
$\underset{\text{Yellow colour}}{Na _{2} CrO _{4}}+2 Fe _{2} O _{3}+8 O _{2}$
$2 Na _{2} CrO _{4} \xrightarrow{2 H ^+} \underset{\text{Orange}}{Na _{2} Cr _{2} O _{7}}+2 Na ^{+}+ H _{2} O$