FeCr_2O_4 (chromite) is converted to Cr by following steps: Chromite I Na_2CrO_4 II Cr_2O_3 III Cr. I, II and III are

JEE Advanced Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Advanced

Not in JEE Main or NEET syllabus

(chromite) is converted to Cr by following steps: Chromite \xrightarrow{I} Na_2CrO_4 \xrightarrow{II} Cr_2O_3 \xrightarrow{III} Cr. I, II and III are

(A) | C | C
(B) | | Correct
(C) | |
(D)conc. | |

Answer: (B)

Solution

Industrially, chromite ore is first roasted with NaOH in air to oxidise it to sodium chromate (step I: ). Acidifying and then reducing this with carbon gives (step II: ). Finally, pure chromium metal is obtained from

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Question ID VK-159748