The most important ore of tin is :
Casseterite
Cryolite
Cerusite
None of these
The chief ore of tin is cassiterite or tin stone $\left( SnO _2\right)$
$FeC{r_2}{O_4}$ (chromite) is converted to $Cr$ by following steps :
Chromite $\xrightarrow{I}NaCr{O_4}\,\,\xrightarrow{{II}}\,C{r_2}{O_3}\,\xrightarrow{{III}}\,Cr$
Reagents in $I,\,II$ and $III$ step might be
$I-$ Step $-$ $II-$ Step $-$ $III-$ Step
The zone refining of metal is based on the principle of
Boron can be obtained by various methods but not by
Poling process is used for
The major components of German Silver are :
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