Kaolinite,a form of clay,is the ore of metal $x$ and malachite is the ore of metal $y$. $x$ and $y$ respectively are:

Which one of the following sets is not correctly matched?

Match the following List-$I$ (Name of the mineral) with List-$II$ (Type):
| List-$I$ | List-$II$ |
| :--- | :--- |
| $A$. Calamine | $I$. Sulphide |
| $B$. Bauxite | $II$. Halide |
| $C$. Kaolinite | $III$. Carbonate |
| $D$. Cryolite | $IV$. Oxide |
| | $V$. Silicate |

Sulfide ores are common for the metals

What is the chemical formula of Ruby Silver?

In the extraction of copper,the ore used is: