Question

The correct order of thermal stability of hydrogen halides $\left( {{\rm{H}} - {\rm{X}}} \right)$ is:
A. ${\rm{HI}} > {\rm{HBr}} > {\rm{HCl}} > {\rm{HF}}$
B. ${\rm{HF}} > {\rm{HCl}} > {\rm{HBr}} > {\rm{HI}}$
C. ${\rm{HCl}} > {\rm{HF}} > {\rm{HBr}} > {\rm{HI}}$
D. ${\rm{HI}} > {\rm{HCl}} > {\rm{HF}} > {\rm{HBr}}$

Answer 1

Hint: We know that the thermal stability is described by the respective amount of energy or rate is required to break the bond. The basic meaning of bond strength is how the atoms are connected or bonded with each other and what amount of energy is required for breaking that bond.

Complete step by step answer:
As we already know, thermal stability can usually be affected by the temperature and it shows the breaking of the chemical bonds which are present in any chemical compound by the electric current. The compound hydrogen halides is the combination of hydrogen and halogens. As we move in the downward direction of the group in the periodic table, the thermal stability of the hydrogen halides decrease because of decreases in the bond strength. The hydrogen halides are one of the diatomic inorganic compounds. The hydrogen halides are generally gaseous in state which reacts with water to give the acid and these acids are termed as hydrohalic acids. Thus, the correct order of thermal stability of hydrogen halides is ${\rm{HF}} > {\rm{HCl}} > {\rm{HBr}} > {\rm{HI}}$.

Hence, the correct answer for this question is B.

Note:
The hydrogen halide is used in most of the chemical reactions and the aqueous form of hydrogen halide is acidic in nature and comes in the category of acids. The halogen halides affect the human body in a bad way like hydrogen chloride directly affects the lungs and causes breathing problems.