Write any two ores with formulae of the following metals.
a) Al b) Zn c) Fe d) Cu

The question asks us to write any two ores with their chemical formulae for the metals aluminum (Al), zinc (Zn), iron (Fe), and copper (Cu). Ores are naturally occurring minerals from which metals can be extracted economically. Let's understand and list two ores for each metal:

a) Aluminum (Al)

1. Bauxite: Its formula is Al₂O₃·2H₂O. It is the primary ore of aluminum and is rich in hydrated aluminum oxide.
2. Cryolite: Its formula is Na₃AlF₆. This is another important ore used in aluminum extraction.

We write any two ores because aluminum is commonly found in multiple ores, but these two are the most significant.

b) Zinc (Zn)

1. Zinc blende: Its formula is ZnS. This is a major ore for zinc extraction, containing zinc sulfide.
2. Zincite: Its formula is ZnO. This ore is an oxide of zinc and is less common but still used in zinc production.

When we write any two ores of zinc, these examples show the diversity of zinc compounds.

c) Iron (Fe)

1. Hematite: Its formula is Fe₂O₃. It is a widely used ore of iron and contains iron(III) oxide.
2. Magnetite: Its formula is Fe₃O₄. This ore contains both iron(II) and iron(III) oxides, making it magnetic and valuable.

For iron, we write any two ores to highlight the different oxides in which iron occurs.

d) Copper (Cu)

1. Cuprite: Its formula is Cu₂O. It is a red-colored ore of copper, rich in copper(I) oxide.
2. Copper glance: Its formula is Cu₂S. This ore contains copper(I) sulfide and is an important source of copper.

We write any two ores of copper to show its occurrence in both oxides and sulfides.