name a food preservative which is most commonly used in food products?

Most common food preservatives are:
Potassium hydrogen sulfite, disodium EDTA, sorbic acid and its salts, benzoic acid and its salts and calcium propionate
Some natural food preservative which are traditionally used are: 
Salt, sugar, alcohol, castor oil, vinegar and rosemary extract.
 

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Sodium benzoate, vinegar, salts of sorbic acid and propionic acid are commonly used food preservatives.

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Commonly Used Food Preservative In Food Products Are Salt, Sugar, Vinegar, Vegetable Oil, Sodium Benzoate Etc.

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