`FeCr_(2)O_(4)(` chromite `)` is converted to `Cr` by following steps `:`
Chromite `overset(I)rarrNa_(2)CrO_(4)overset(II)rarrCr_(2)O_(3)overset(III)rarr Cr`
Reagents in `I,II,` and `III` step might be `:`

Options

A. `{:(I-"step",,II- "step",,III-"step"),(Na_(2)CO_(3)//"air,"Delta,,C,,C):}`
B. `{:(I-"step",,II- "step",,III-"step"),(NaOH//"air,"Delta,,C","Delta,,At"," Delta):}`
C. `{:(I-"step",,II- "step",,III-"step"),(NaOH//"air,"Delta,,C","Delta,,C"," Delta):}`
D. `{:(I-"step",,II- "step",,III-"step"),("conc." H_(2)SO_(4)","Delta,,NH_(4)Cl","Delta,,C"," Delta):}`

Answer

2

Explanation

Chromite `overset(NaOH//"air"Delta)rarrNa_(2)CrO_(4)overset(C,Delta)rarrCr_(2)O_(3)overset(Al,Delta)rarrCr`