Chromite ore on fusion with sodium carbonate gives · ABC26IN0193
Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: CSIR NET 2014 · Marks: 2 · Difficulty: Easy
Chromite ore on fusion with sodium carbonate gives
(a)$\mathrm{Na_2CrO_4}$ and $\mathrm{Fe_2O_3}$
(b)$\mathrm{Na_2Cr_2O_7}$ and $\mathrm{Fe_2O_3}$
(c)$\mathrm{Cr_2(CO_3)_3}$ and $\mathrm{Fe(OH)_3}$
(d)$\mathrm{Na_2CrO_4}$ and $\mathrm{Fe_2(CO_3)_3}$
Answer
Explanation
Chromium is extracted from chromite ore: (I) 4FeCr2O4, +8Na2CO3 +7O2 → 8Na2CrO4 +2Fe2O2 +8CO2 (II) 2Na2CrO4+H2SO4 → Na2SO4 + Na2Cr2O7 + H2O (III) Na2C2O7+2C → Cr2O7 +Na2CO3 +CO (IV) Cr2O3 +2A1 → Al2O3 + 2Cr
Explanation as extracted from the printed page; notation may be imperfect.
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