Question

Which of the following are peroxoacids of sulfur?

• A. ${\mathrm{H}}_2{\mathrm{SO}}_5$ and ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$
• B. ${\mathrm{H}}_2{\mathrm{SO}}_5$ and ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$
• C. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$ and ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$
• D. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_6$ and ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$

Answer 1

The correct option is A

${\mathrm{H}}_2{\mathrm{SO}}_5$ and ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$

Explanation for correct option

(A) ${\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{5}}$ and ${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{8}}$

Peroxoacids of sulphur

• In the case of sulfur, a considerable number of oxyacids—either in the free state, in the form of salts, or both—are known.
• Peroxoacids of sulfur are the name for acids that have an $\mathrm{O}-\mathrm{O}$ bond.
• Peroxy linkage denotes the presence of an oxygen-oxygen $(\mathrm{O}-\mathrm{O})$ bond within a molecule.

${\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{5}}$

• Two hydrogen atoms, one sulfide atom, and five oxygen atoms make up ${\mathrm{H}}_2{\mathrm{SO}}_5$ .
• All atoms require a total of $38$ valence electrons in order to adopt the noble gas structure.
• Hence. it is the peroxoacids of sulfur.
• Structure of ${\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{5}}$:
• 

${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{8}}$

• Two hydrogen atoms, two sulfide atoms, and eight oxygen atoms make up the compound ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$.
• Thus, ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$ contains $62$ valence electrons in total.
• All atoms require $62$ valence electrons in total to adopt the noble gas structure.
• Hence. it is the peroxoacids of sulfur.
• Structure of :

The explanation for incorrect options

(B) ${\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{5}}$ and ${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{7}}$

• Two hydrogen atoms, two sulfide atoms, and seven oxygen atoms make up the compound ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$.
• ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$ contains $56$ valence electrons in total.
• All atoms require $56$ valence electrons in total for the formation of the noble gas configuration.
• Hence, it is not the peroxoacids of sulfur.

(C) ${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{7}}$ and ${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{8}}$

• ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$ is not the peroxoacids of sulfur.
• Two hydrogen atoms, two sulfide atoms, and eight oxygen atoms make up the compound ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$.
• Thus, ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$ contains $62$ valence electrons in total.
• All atoms require $62$ valence electrons in total to adopt the noble gas structure.
• Hence, it is the peroxoacids of sulfur.

(D) ${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{6}}$ and ${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{7}}$

• Two hydrogen atoms, two sulfide atoms, and six oxygen atoms make up the compound ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_6$.
• ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_6$ contains $50$ valence electrons in total.
• All atoms require a total of $50$ valence electrons in order to adopt the noble gas structure.
• Hence, it is not the peroxoacids of sulfur.
• ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$ is not the peroxoacids of sulfur.

Therefore, the correct option is (A) ${\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{5}}$ and ${\mathbf{H}}_{\mathbf{2}}{\mathbf{S}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{8}}$.