Saved Bookmarks
| 1. |
Roasting of ores is done inA. moisture is removedB. non-metals as their volatile oxide are removedC. ore become porocus.D. all the above. |
|
Answer» Correct Answer - D Roasting removes easily oxidisable volatile impurities like aresenic `(As_(2)O_(3))`, sulphur (as `SO_(2)`, phosphorus (as`P_(4)O_(10))` and antimony (as `Sb_(2)O_(3))`. `4M(M = As, Sb) +3O_(2)rarr 2M_(2)O_(3)` `S+O_(2)rarr SO_(2), P_(4) +4O_(2) rarr P_(4)O_(10)` Organic matter moisture if present in the ore, also get expelled and the ore becomes porous. |
|