Question

what is chemical method ?
some Chemicals like sodium benzoate and sodium metabisulphite are used to check the growth of microbes ​

Answer 1

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• Chemical methods include chemical precipitation, chemical oxidation or reduction, formation of an insoluble gas followed by tripping, and other chemical reactions that involve exchanging or sharing electrons among atoms.

• Salts and edible oils are the common chemicals generally used to check the growth of microorganisms. Therefore they are called preservatives. Sodium benzoate and sodium metabisulphite are common preservatives. These are also used in the jams and squashes to check their spoilage.