Question

Are all metal oxides, carbonates, hydroxides basic in nature?

Answer 1

Bases, on the other hand, have a bitter taste and are slippery to the touch. A base that can dissolve in water is referred to as "alkali." When these substances react chemically with acids, salts are formed. It's common for bases to become red litmus blue.

Complete answer:
Most of the metal Oxides, carbonates and Hydroxides are known to be basic in nature.
Some exceptions are there: -
$Os{O_4},V2{O_5}\;,Cr{O_3}\;$ are some metallic oxides that are acidic in nature because of the large Oxidation number of the Metal.
$A{l_2}{O_3}\;,PbO,ZnO\;$ are Amphoteric oxides.
Metallic oxides are basic in nature because when they react with dilute acids, they produce salt and water. Group $1$ and $2$ oxides are referred to as alkaline metals and alkaline Earth metals, respectively, due to their strong alkaline character.
Metal carbonates are a type of base that react with an acid to form salt, water, and carbon dioxide.
The hydroxides are basic in nature, and their basic strength rises as they progress through the group. The basic strength of the hydroxides rises as the ionisation energy lowers down the group.

Note:
Amphoteric oxides are oxygen-based molecules that have both acidic and basic properties. When these oxides combine with acid, a neutralisation reaction occurs, resulting in the formation of water and salt. This demonstrates the compounds' fundamental property. Similar to the alkali, it combines with it to generate salt and water, giving it an acidic property. Aluminium oxide, for example.