Which one of the following is an ore of silver?

The salt which is least likely to be found in minerals is

Ferrosoferric oxide is known as .....

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.

Copper can be extracted from

Calamine,malachite,magnetite and cryolite,respectively are