Question

Which of the following is not a hydra acid?

• A. $\mathrm{HCl}$
• B. ${\mathrm{H}}_2\mathrm{S}$
• C. ${\mathrm{H}}_2{\mathrm{SO}}_3$
• D. $\mathrm{HBr}$

Answer 1

The correct option is C

${\mathrm{H}}_2{\mathrm{SO}}_3$

A hydra acid :

A hydra acid contains only hydrogen atoms ($\mathrm{H}$) bonded to a non-metal in its structure and it does not contain any oxygen.

Explanation of the correct option:

As H₂SO₃ (Sulphurous acid) contains hydrogen atoms bonded to the oxygen atoms, thus it is an oxy acid.

Hence, H₂SO₃ is not a hydra acid.

Explanation of the incorrect options:

A: $\mathrm{HCl}$ (Hydrochloric acid) contains only Hydrogen bonded to a Chlorine atom and there is no Oxygen. Thus, $\mathrm{HCl}$ is a hydra acid.

B: ${\mathrm{H}}_2\mathrm{S}$ (Hydrogen sulphide) contains only Hydrogen bonded to Sulphur atom and there is no Oxygen. Thus, ${\mathrm{H}}_2\mathrm{S}$ is a hydra acid.

D: $\mathrm{HBr}$ (Hydrogen bromide) contains only Hydrogen bonded to a bromine atom and there is no Oxygen. Thus, $\mathrm{HBr}$ is a hydra acid.

Hence the correct option is C., ${\mathrm{H}}_2{\mathrm{SO}}_3$ which is not a hydra acid.