Black Jack is an ore of
$Cr$
$Sn$
$Zn$
$Ni$
(c)Black Jack $(ZnS)$, also called zinc blend, is an ore of Zinc.
Consider the following statements :
Roasting is carried out to :
$(i)$ convert sulphide to oxide and sulphate
$(ii)$ remove water of hydration
$(iii)$ melt the ore
$(iv)$ remove arsenic and sulphur impurities
Of these statements :
Which of the following is not correct ?
Method used for obtaining highly pure silicon used as a semiconductor material is
Cast iron is used for the manufacture of
In the extraction of copper from its sulphide ore, the metal is formed by reduction of $Cu_2O$ with
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