In which furnace is pig iron produced? State its impurities.

Assertion : Copper obtained after $Bessemerization$ is known as blister copper.
Reason : Blisters are produced on the surface of the metal due to escaping of dissolved $SO_2$.

Extraction of gold $(Au)$ involves the formation of complex ions $X$ and $Y$ as shown in the reaction: $\text{Gold ore}$ $\xrightarrow{CN^-, H_2O, O_2} HO^- + X$ $\xrightarrow{Zn} Y + Au$. $X$ and $Y$ respectively are:

The modern method of steel manufacturing is

Which of the following processes is associated with the smelting stage?

Name the metal $M$ which is extracted on the basis of following reactions:
$4M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^{-} + 4OH^{-}$
$2[M(CN)_2]^{-} + Zn \rightarrow [Zn(CN)_4]^{2-} + 2M$