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

From the Ellingham graphs on carbon,which of the following statements is false?

In the cyanide process for the extraction of $Ag$ from argentite,the oxidizing agent and reducing agent used are respectively:

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.
Reason $R$: The value of $\Delta G^{\ominus}$ becomes more on negative side as entropy is higher in liquid state than solid state.
In the light of the above statements,choose the most appropriate answer from the options given below.

Which one of the following metals is extracted by thermal reduction process?

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