Which of the following compounds is used for the extraction of aluminum by electrolysis?

To obtain silver from silver amalgam,it is heated in a vessel which is made of

Which one of the following electrolytes is used in Down's process for the extraction of sodium metal?

In the extraction process of copper,the product obtained after carrying out the reactions
$(i) 2 Cu_2S + 3 O_2 \rightarrow 2 Cu_2O + 2 SO_2$
$(ii) 2 Cu_2O + Cu_2S \rightarrow 6 Cu + SO_2$ is called

Iron can be obtained on a large scale from $Fe_2O_3$ by which of the following methods?

Given below are two statements.
Statement $I$: According to the Ellingham diagram,any metal oxide with higher $\Delta G^{\circ}$ is more stable than the one with lower $\Delta G^{\circ}$.
Statement $II$: The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram.
In the light of the above statements,choose the correct answer from the options given below.