Leaching of $Ag_2S$ is carried out by heating it with a dilute solution of

$Al _{2} O _{3}$ was leached with alkali to get $X$. The solution of $X$ on passing of gas $Y$, forms $Z . X$ $Y$ and $Z$ respectively are

Which one of the following ores is known as Malachite

Statement $I :$ Leaching of gold with cyanide ion in absence of air $/ O _{2}$ leads to cyano complex of $Au ( III )$.

Statement $II :$ Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, choose the correct answer from the options given below.

Most abundant metal in earth crust is