state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Chemistry d And f - Block Elements

Chromate ore has a spinel structure and is the chromium analogue of magnetite, Fe3O4. This ore, when fused with molten NaOH in presence of air, forms

1
Cr2O3
2
Na2Cr2O7
3
Na2CrO4
4
CrO7
5
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