Block D and F Elements Class 12th Chemistry Ncert Solutions Chemistry Class 12th

8.36 Indicate the steps in the preparation of: (i) K₂Cr₂O₇ from chromite ore. (ii) KMnO₄from pyrolusite ore.

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Payal Gupta | Contributor-Level 10

8 months ago

8.36 (i) The chromite ore (FeCr₂O₄) is fused with sodium hydroxide (NaOH)

4FeCr₂O₄ +16 NaOH+ 7O₂ → 8Na₂CrO₄ +2Fe₂O₃ +8H₂O

The yellow solution of sodium chromate is then filtered and acidified with sulphuric acid giving its dichromate.

2Na₂CrO₄ +H₂SO₄→ Na₂Cr₂O₇ + Na₂SO₄ +H₂O

On cooling, sodium sulphate c

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Chemistry Ncert Solutions Class 12th 2023

Chemistry Ncert Solutions Class 12th 2023

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