Which of the following is not added during the extraction of silver by the cyanide process?

In the alumino thermite process,$Al$ acts as

Cryolite $(Na_3AlF_6)$ helps in:

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

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.

Alumino-thermic process is used for the extraction of metals,whose oxides are