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.......

What does the slag obtained during the extraction of iron primarily consist of?

Write a note on wrought iron.

Which process is used for the purification of aluminum?

In the electrolytic process of extraction of aluminum,what is used as the electrolyte?

Given are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Magnesium can reduce $Al_{2}O_{3}$ at a temperature below $1350^{\circ} C$,while above $1350^{\circ} C$ aluminium can reduce $MgO$.
Reason $R$: The melting and boiling points of magnesium are lower than those of aluminium.
In light of the above statements,choose the most appropriate answer from the options given below: