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Question

FeCr2O4 (chromite) is converted to Cr by following steps :
Chromite I NaCrO4 II Cr2O3 III Cr
Reagents in I, II and III might be :
I- Step II-Step III-Step

A
Na2CO3/air,CC
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B
NaOH/air,C,Al,
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C
Na2CO3/air,C,C,
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D
conc.H2SO4,NH4Cl,C,
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Solution

The correct option is B NaOH/air,C,Al,
Chromite ore is heated with sodium hydroxide in air to obtain sodium chromate. It is then heated with carbon to obtain chromium trioxide. It is then heated with aluminum to form chromium. This is reduction of chromium trioxide to chromium.
FeCr2O4ChromiteNaOH/air.−−−−−−−NaCrO4C,Cr2O3Al,−−Cr

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