Statement I: Leaching of gold with cyanide ion in absence of air / ${\mathrm{O}}_2$ leads to cyano complex of $\mathrm{Au}$(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.

Given are two statements one is labelled as Assertion and other is labelled as Reason.

Assertion: Magnesium can reduce ${\mathrm{Al}}_2{\mathrm{O}}_3$ at a temperature below $1350 °\mathrm{C}$, while above $1350 °\mathrm{C}$ aluminium can reduce $\mathrm{MgO}$.

Reason: The melting and boiling points of magnesium are lower than those of aluminium.

In light of the above statements, choose most appropriate answer from the options given below

In the metallurgical extraction of copper, following reaction is used :

$\mathrm{FeO}+{\mathrm{SiO}}_2\to {\mathrm{FeSiO}}_3$

$\mathrm{FeO}$ and ${\mathrm{FeSiO}}_3$ respectively are.

Match List $\mathrm{I}$ with List $\mathrm{II}$.

Choose the correct answer from the options given below:

The compound(s) that is(are) removed as slag during the extraction of copper is :

(1) $\mathrm{CaO}$

(2) $\mathrm{FeO}$

(3) ${\mathrm{Al}}_2{\mathrm{O}}_3$

(4) $\mathrm{ZnO}$

(5) $\mathrm{NiO}$

Choose the correct answer from the options given below

Given below are two statements.

Statement I : Pig iron is obtained by heating cast iron with scrap iron.

Statement II : Pig iron has a relatively lower carbon content than that of cast iron.

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