Which of the following compositions does not contain tin $(Sn)$?

Identify the metals present in brass.

Which of the following is not a mineral of aluminium?

Which of the following set of elements mostly occur as sulphide ores?

Select the correct option using $T$ (True) or $F$ (False) for the following statements:
$(1)$ $A$ mineral cannot be an ore.
$(2)$ An ore cannot be a mineral.
$(3)$ All minerals are ores.
$(4)$ All ores are minerals.

The metal that is not extracted from its sulphide ore is: