Question

What is the molecular formula of marshalls acid?

• A. ${\mathrm{H}}_2{\mathrm{SO}}_5$
• B. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$
• C. ${\mathrm{H}}_2{\mathrm{SO}}_4$
• D. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$

Answer 1

The correct option is B

${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$

Explanation for correct option:

B. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$

Marshall's acid:

• The chemical name for marshall's acid is Peroxydisulfuric acid.
• The chemical formula of Peroxydisulfuric acid is ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$.
• It is an inorganic compound that is soluble in water.
• The structure of Peroxydisulfuric acid is given below:

Explanation for incorrect options:

Option A: The chemical name of the compound having molecular formula ${\mathrm{H}}_2{\mathrm{SO}}_5$ is Peroxymonosulfuric acid.

Option C: The chemical name of the compound having molecular formula ${\mathrm{H}}_2{\mathrm{SO}}_4$ is sulfuric acid.

Option D: The chemical name of the compound having molecular formula ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$ is Disulfuric acid.

Hence, option (B) is correct i.e. the molecular formula of marshalls acid ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$.