The correct statements(s) related to the metal extraction processes is(are)

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A mixture of PbS and PbO undergoes self-reduction to produce Pb and $S O_{2} .$

In the extraction process of copper from copper pyrites, silica is added to produce copper silicate

Partial oxidation of sulphide ore of copper by roasting followed by self-reduction produces blister copper

In cyanide process, zinc powder is utilized to precipitate gold from $N a [A u {(C N)}_{2}]$

answer is A, C, D.

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Detailed Solution

(a) $P b S + 2 P b O \to 3 P b + S O_{2}$ (self reduction)
(b) Silica is added to remove impurity of Fe in the form of slag $F e S i O_{3}$ . Hence, this statement is wrong
(c) Sulphide ore is partially oxidized first by roasting and then self reduction of Cu takes place to produce blister copper
$\begin{array}{l} C u_{2} S + \frac{3}{2} O_{2} \to C u_{2} O + S O_{2} ↑ \\ C u_{2} S + 2 C u_{2} O \to 6 C u + S O_{2} ↑ (s e l f r e d u c t i o n) \end{array}$
The molten copper obtained is poured into large container and allowed to cool and during cooling the dissolved $S O_{2}$ comes up to the surface and forms blisters. It is known as blister cooper.
(d) $2 N a [\overset{+ 1}{A u} {(C N)}_{2}] + \underset{\begin{array}{l} Re d u c i n g \\ A g e n t \end{array}}{Z n} \to N a_{2} [\overset{+ 2}{Z n} {(C N)}_{4}] + 2 \overset{o}{A}$