In the metallurgy of iron,when limestone is added to the blast furnace,the calcium ions end up in:

Which alloy contains $Cu$,$Sn$ and $Zn$?

Identify the metal which is not common to German silver and brass.

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.
$(i)$ In Goldschmidt thermite process,aluminium acts as a reducing agent.
$(ii)$ $Mg$ is extracted by electrolysis of aqueous solution of $MgCl_2$.
$(iii)$ Extraction of $Pb$ is possible by carbon reduction method.
$(iv)$ Red Bauxite is purified by Serpeck's process.

The statement that is $INCORRECT$ about Ellingham diagram is :

In the wrought iron of the iron pillar located in Delhi,what other elements are present besides iron?