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Chemistry
Chemistry
Problem
FeCr
2
O
4
\text{FeCr}_2\text{O}_4
FeCr
2
O
4
(chromite) is converted to Cr by following steps :
Chromite
→
I
Na
2
CrO
4
→
II
Cr
2
O
3
→
III
Cr
\text{Chromite} \xrightarrow{\text{I}} \text{Na}_2\text{CrO}_4 \xrightarrow{\text{II}} \text{Cr}_2\text{O}_3 \xrightarrow{\text{III}} \text{Cr}
Chromite
I
Na
2
CrO
4
II
Cr
2
O
3
III
Cr
Reagents in I, II and III step might be : a.
Na
2
CO
3
/
air
,
Δ
\text{Na}_2\text{CO}_3/\text{air}, \Delta
Na
2
CO
3
/
air
,
Δ
, C, C b.
NaOH
/
air
,
Δ
\text{NaOH}/\text{air}, \Delta
NaOH
/
air
,
Δ
,
C
,
Δ
\text{C}, \Delta
C
,
Δ
,
Al
,
Δ
\text{Al}, \Delta
Al
,
Δ
c.
Na
2
CO
3
/
air
,
Δ
\text{Na}_2\text{CO}_3/\text{air}, \Delta
Na
2
CO
3
/
air
,
Δ
,
C
,
Δ
\text{C}, \Delta
C
,
Δ
,
C
,
Δ
\text{C}, \Delta
C
,
Δ
conc.
H
2
SO
4
,
Δ
\text{H}_2\text{SO}_4, \Delta
H
2
SO
4
,
Δ
,
NH
4
Cl
,
Δ
\text{NH}_4\text{Cl}, \Delta
NH
4
Cl
,
Δ
,
C
,
Δ
\text{C}, \Delta
C
,
Δ
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