Question

Which of the following are found as carbonate ore in nature?
A.$Fe$
B.$Mg$
C.$Zn$
D.$Pb$

Answer 1

As we know that in nature, a majority of elements are not present in free state due to their reactivity in the open environment. These elements are formed in various compositions. Some in the forms of ores as well. Carbonate ore is an ore that contains carbonate components - $C{O_3}$ in their composition. They can be aqueous or non-aqueous in nature.

Complete step by step answer:
We need to know that the Iron is a chemical element with the symbol $Fe$ derived from Latin name ferrum. It is a metal that belongs to group 8 of the periodic table. In nature, iron is not found in a free state. It exists as oxides. The metallic iron is extracted from iron ores.
We have to know that the Magnesium is a chemical element with the symbol $Mg$ . It belongs to the group 2 elements of the periodic table. All group 2 elements have a crystalline structure. Magnesium occurs naturally in combination with other elements which has an oxidation number of $+ 2$ . It is highly reactive when exposed to oxygen.
We need to know that the Zinc is a chemical element of the symbol $Zn$ and belongs to the group 12 of the periodic table. It is chemically similar to magnesium. Zinc are found in ores. The most common zinc ore is sphalerite.
We must have to know that the Lead is a chemical element with the symbol $Pb$ derived from the Latin name plumbum. It is a heavy metal which belongs to the group 14 of the periodic table. Lead is extracted from ores. It is not freely present on the earth surface.
Hence, from this study we can observe that the elements of the middle activity series are moderately reactive and they are generally found in the earth’s crust as oxides, sulphides or carbonates.
Hence, the correct answers to the question are options A, C and D.

Note:
We have to remember that the ores are raw forms of any compound. They do come with the parent metal but also contain many other metals or non-metals and other impurities as well. They are extracted to obtain the parent product as a whole and other by-products are also obtained as they are present in the ore as an impurity. We also remember that the Potassium, sodium, calcium, magnesium, aluminium, zinc, iron, lead, etc. are metals that are found in combined form or in ores.