Occurrence Of Metals

Haematite is an ore of iron with the chemical formula Fe₂O₃ → matches (iii)
Cinnabar is the main ore of mercury, chemical formula HgS → matches (i)
Hornsilver is another name for silver chloride → matches (iv)
Magnetite is an iron ore with formula Fe₃O₄ → matches (ii)

The correct option is (B): a-iii, b-i, c-iv, d-ii

Calcination is the process of heating carbonate ores in the absence or limited supply of air. This is done to remove volatile impurities or to convert the ore into its oxide form. For example: Roasting, on the other hand, involves heating in the presence of excess air and is generally used for sulfide ores.

The correct answer is option (A): calcination

The elements in Group IVA (carbon family) are:

• Carbon ( ),
• Silicon ( ),
• Germanium ( ),
• Tin ( ),
• Lead ( ).

Among these, only carbon ( ) is a non-metal. The others are either metalloids or metals.

Final Answer: The non-metal in Group IVA is , which corresponds to option .