The correct statement regarding the given Ellingham diagram is:

Q. In the extraction of some metals from their ores, coke can be used as:

Q. Consider the following reaction at ${1000}^{\circ }\text{C}$,
$i.Zn\left(s\right)+\frac{1}{2}{O}_2\left(g\right)\to ZnO\left(s\right);\Delta G=-360\text{KJ/mol}$
$ii.C\left(s\right)+\frac{1}{2}{O}_2\left(g\right)\to CO\left(s\right);\Delta G=-460\text{KJ/mol}$
Then choose the correct statement from the following

Q. The chief ore of $Zn$ is its sulphide, $ZnS$. The ore is concentrated by froth floatation process and then heated in air to convert $ZnS$ to $ZnO$. The following reactions take place in the extraction of $Zn$:
$2ZnS+3O_2\to 2ZnO+2S{O}_2\text{(Yield: 62.5 \%)}$
$ZnO+H_{2}S{O}_4\to ZnS{O}_4+H_{2}O\text{(Yield: 80 \%)}$
$2ZnS{O}_4+2H_{2}O\to 2Zn+2H_{2}S{O}_4+O_2\text{(Yield: 80\%)}$
The number of moles of $ZnS$ required for producing $2$ mol of $Zn$ will be:

Q. Approximate $K_c$ for the reaction at ${25}^{o}C$ will be:
$Zn\left(s\right)+{Cu}^{2+}\left(aq\right)={Zn}^{3+}\left(aq\right)+Cu\left(s\right)$
$E_{{Zn}^{2+}/Zn}^o=-0.76V{E}_{Cu/{Cu}^{2+}}^o=-0.34V$

Q. Leaching can be used for the extraction of which metals?
$\left(i\right)Pb$
$\left(ii\right)Al$
$\left(iii\right)Ag$
$\left(iv\right)Au$