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).