Chemical formula of potassium metabisulphite is

Answer: Option B

Potassium metabisulphite is also known as potassium pyrosulphite, it is a white crystalline powder with the chemical formula K₂S₂O₅.
It can be prepared by treating a solution of potassium hydroxide with sulphur dioxide.
It is mainly used as an antioxidant or chemical sterilant, a food additive