Saved Bookmarks
| 1. |
Extraction of metal fron the ore cassiterlate involves (i) carbon reduction of an oxide are self reduction of a sulphide or (iii) removal of copper imputiry (iv) removel of iron inpurityA. (i),(ii),(iii),(iv)B. (ii),(iii),(iv)C. (i),(iv)D. (i),(iii) and (iv) |
|
Answer» Correct Answer - d T in does not occur free in nuture be chef source is the ore cascherite `SaO_(2)` also known as tin same ,The extraction of tin metal from cauterls `SaO_(2)` is condocted through following stages (i) Concentration ,which is done by hydraulic washing and magnitic sepration (ii) Reasting to oxides sulphur to `SO_(2)` and aresenic to `AI_(2)O_(3)` (iii) Smelting to reduce its oxide to be metal `SaO_(2) + 2C rarr Sn + 2CO` Tin so obtained is crude and contain iros impurities its reflsaing is done in two stage (a) Liquation which consite in heating the crate metal on the sloping hearth of a reverately farmace .The on metal flows down having behind iron copper tangestan, etc (b) polling which involves storing of the mothen metal taken in a big pot by logs of work .Any tin oxide left unreducal is now reduced by tyhe hydrocathons of wood. |
|