After froth flotation,copper sulfide is reduced by.........

Consider the following reactions at $1000\,^{\circ}C$:
$(I)$ $Zn_{(s)} + 1/2 O_{2(g)} \xrightarrow{\Delta} ZnO_{(s)};$ $\Delta G^o = -360\,kJ\,mol^{-1}$
$(II)$ $C_{(s)} + 1/2 O_{2(g)} \xrightarrow{\Delta} CO_{(g)};$ $\Delta G^o = -460\,kJ\,mol^{-1}$
Choose the correct statement at $1000\,^{\circ}C$.

The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is:

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

At temperatures above $1073 \ K$,coke can be used to reduce $FeO$ to $Fe$. How can you justify this reduction with an Ellingham diagram?

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