Question

Out of the following, select Lux-Flood Acid.
A. $\text{C}{{\text{O}}_{2}}$
B. $\text{B}{{\text{F}}_{3}}$
C. ${{\text{H}}^{+}}$
D. $\text{Al(C}{{\text{H}}_{3}}{{)}_{3}}$

Answer 1

Hint: The Lux-Flood acid is those molecules which can accept the oxide ion easily whereas the Lux-Flood base is those molecules which can donate the oxide ion easily to the oxide ion acceptor. Oxide ion is represented by ${{\text{O}}^{-2}}$.

Complete step by step answer:
- In the given question, we have to identify the molecule which is Lux-Flood acid.
- The term Lux- Flood concept was given to those species which do not have protons (protons are the positively charged particles).
- As we know that Lux- Flood acid are those compounds which allow oxide ions to make the bond with them whereas Lux- Flood base is those compounds which does not allow oxide ions to make the bond with them.
- Among the given compounds, carbon dioxide is Lux- Flood acid because it can easily accept the oxide when it reacts with calcium oxide.
- The reaction is: $\text{CaO + C}{{\text{O}}_{2}}\text{ }\to \text{ C}{{\text{a}}^{2+}}\text{ + CO}_{3}^{-2}$

- Here, calcium oxide is the Lux - Flood base. It is donating an oxide ion to the carbon dioxide whereas carbon dioxide is the Lux - Flood acid because it is accepting an oxide ion from calcium oxide.
-Whereas other molecules that are $\text{B}{{\text{F}}_{3}}$, ${{\text{H}}^{+}}$, $\text{Al(C}{{\text{H}}_{3}}{{)}_{3}}$ are neither Lux - Flood acid nor Lux - Flood base because they don't even have oxide ion to donate and also they cant accept oxide ion.
So, the correct answer is “Option A”.

Note: Along with Lux - Flood theory many other theories were also given such as Lowry Bronsted theory, Lewis theory, etc. The Lux - Flood theory was given by two scientists Lux and Flood. This theory is also helpful is the systematisation of the noble gas compounds such as xenon oxide.