Question

Which among the following is the correct formula of Per-chloric acid
(A) $ HCl{O_3} $
(B) $ HCl{O_4} $
(C) $ HCl{O_2} $
(D) $ HCl{O_{}} $

Answer 1

Hint :Per-chloric acid is an oxide and behaves as an acid which gives $ {H^ + } $ ions in water. It is a mineral strongest acid it gives $ {H^ + } $ rapidly in aqueous medium.

Complete Step By Step Answer:
Per-chloric acid behaves as a strong oxidising agent.it is soluble in water because it forms hydrogen bonds with water molecules. It plays a very important role in the digestion of food like fat. Per-chloric acid is a colourless compound. A Per-chloric acid functional group ( $ - OH $ ) is present. Due to this group it forms hydrogen bonds with water molecules and becomes soluble in water.
The molecular formula of Per-chloric acid is $ HCl{O_4} $ . In which the chlorine atom bonded with three oxygen atoms through double bond and chlorine atom makes one bond with the $ - OH $ group.
Hence option B is the correct option.

Additional Information:
At $ {245^o}C $ Per-chloric acid is decomposed. And the melting point of per-chloric acid $ - {17^o}C $ . Per-chloric acid is odourless and oily in nature.
The boiling point of Per-chloric acid is $ {203^O}C $ .
The molecular weight of Per-chloric acid is $ 100.46g/mol $ .
Per-chloric acid is a strong acid as compared to the sulphuric acid $ \left( {{H_2}S{O_4}} \right) $ .
When Per-chloric acid is heated then it produces toxic fumes so to handle this Per-chloric acid is needed by a very expert person.

Note :
Per-chloric acid plays a very important role in rocket fuel. It behaves as a very good catalyst that speeds up the chemical reaction.
It is used in a plating of metal so metal remains corrosion free.
For the separation of sodium and potassium Per-chloric acid is used. It is used in the electrical industry(LCD).