In which of the following pairs of metals are both commercially extracted from their respective ores by the carbon reduction method?

State the role of silica in the metallurgy of copper.

The Ellingham diagram for zinc,magnesium and carbon converting into corresponding oxides is shown below.
At $........$ $^oC$ temperature,zinc and carbon have equal affinity for oxygen.

Which statement is correct?

In the production of iron,limestone is added to the blast furnace. At the end of the process,the $Ca$ ion is in the form of.......

Match column $(I)$ (process) with column $(II)$ (electrolyte)

$(I)$ (process)	$(II)$ (electrolyte)
$(i)$. Downs cell	$(W)$. fused $MgCl_2$
$(ii)$. Dow sea water process	$(X)$. fused $(Al_2O_3 + Na_3AlF_6)$
$(iii)$. Hall-Heroult	$(Y)$. fused $KHF_2$
$(iv)$. Moissan	$(Z)$. fused $(40\% NaCl + 60\% CaCl_2)$

Choose the correct alternate :