Question

Which of the following is the correct formula for a compound of scandium and oxygen?
A. $ S{c_2}O $
B. $ ScO $
C. $ S{c_3}{O_2} $
D. $ S{c_2}{O_3} $

Answer 1

Hint: Scandium is a chemical element with the atomic number of 21 and the periodic table symbol of Sc. Oxygen belongs to the chalcogen group on the periodic table. In the vast majority of combustion processes, it is a required component.

Complete Step By Step Answer:
The oxidation state of Scandium ( $ Sc $ ) is $ + 3 $ and the oxidation state of oxygen ( $ O $ ) is $ - 2 $ .
Hence the formula of the compound of scandium and oxygen is $ S{c_2}{O_3} $ .The name of the compound is scandium oxide.
Optical coatings, catalysts, electronic ceramics, and lasers all use Scandium Oxide. It's also used to make high-intensity discharge lights every year. A high melting white solid utilised in high-temperature systems, electronic ceramics, and glass composition (because of its heat and thermal shock resilience). Vacuum deposition applications are possible.
One of the most important allotropes of oxygen is dioxygen.
The most reactive allotrope of oxygen is trioxygen, which damages lung tissue.
The metal is silvery-white in colour and has a medium-soft texture.
Its stability in air slowly changes to a yellowish form due to the development of $ S{c_2}{O_3} $ oxide on its surface.
With the exception of hydrofluoric acid ( $ HF $ ), which possesses a protective trifluoride layer that prevents further reaction, this metal dissolves slowly in diluted acids.
Hence, the correct option is D. $ S{c_2}{O_3} $ .

Note:
In its natural condition, oxygen is colourless, odourless, and tasteless. Liquid oxygen has a small paramagnetic property. With the exception of helium, neon, krypton, and argon, it is reactive and produces oxides with all other elements. In water, it is somewhat soluble