Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store
seo-qna
SearchIcon
banner

Write the formula of Pyrosulphuric acid:
A)H2S2O7B)H2SO5C)H2S2O8D)Noneofthese

Answer
VerifiedVerified
507.9k+ views
like imagedislike image
Hint: We know that disulfuric acid is otherwise called as pyrosulfuric acid. It is an example of sulfur oxoacid. The salts of disulfur acids are pyrosulfates. An example of pyrosulfate is potassium pyrosulfate.

Complete step by step answer:
We have to know that the IUPAC name of pyrosulfuric acid is disulfuric acid. Oleum is the other name given to pyrosulfuric acid.
In pyrosulfuric acid, there are two atoms of sulfur, seven atoms of oxygen and two atoms of hydrogens. We can draw the structure of pyrosulfuric acid,
seo images

From the given structure, we can see that each sulfur atom is doubled bonded to two oxygen atoms and single bonded to other oxygen atoms. The oxidation state of sulfur in pyrosulfuric acid is  + 6.
We can prepare pyrosulfuric acid by the dissolution of fumes of sulfur trioxide in sulfuric acid.
We can write the chemical reaction as,
H2SO4+SO3H2S2O7
The chemical formula of pyrosulfuric acid is H2S2O7. Therefore, Option (A) is correct.
The compound that has a chemical formula of H2SO5 is peroxymonosulfuric acid. It is also an oxyacid of sulfur. Option (B) is incorrect.
The chemical formula H2S2O8 represents peroxydisulfuric acid. It is also an oxoacid of sulfur.

Hence option (C) is correct.

Note:
We can write the IUPAC name of peroxymonosulfuric acid as peroxydisulfuric acid (or) sulfurperoxic acid. Peroxymonosulfuric acid is used as disinfectant and cleaning in swimming pools. Salts of peroxymonosulfuric acid are used in the plastic industry and for decolorizing oils.
We can write the IUPAC name of peroxydisulfuric acid as persulfuric acid. It Is also known as Marshall’s acid.