In the alumino thermite process,$Al$ acts as

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.

In the extraction of copper from copper glance,blister copper is formed by the evolution of gas $\underline{X}$. The shape of the molecule of $\underline{X}$ is

What is Thomas slag?

Which of the following oxide groups cannot be reduced by carbon?

When bauxite powder is mixed with coke and reacted with nitrogen at $2075 \ K$,carbon monoxide and $X$ are formed. What is the gas formed when $X$ is reacted with water?