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 inpurity

Options

A. (i),(ii),(iii),(iv)
B. (ii),(iii),(iv)
C. (i),(iv)
D. (i),(iii) and (iv)

Answer

d

Explanation

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.