A----Citric acid anhydrous is mainly used as an acidulant , flavorant, preservative in foods and beverages. It also used in pharmaceutical ,chemical and detergent  industries.

B---citric acid monohydrate is mainly used as an acidulant, flavorant and preservative in foods and beverages, it is also used as an antioxidant, plasticizer and detergent builder.

C---sodium citrate is used to enhance flavor and maintain stability of active ingredients in food and beverage. In detergent industry ,it can replace sodium tripolyhosphate as a kind of safe detergent .It can also be used in fermentation ,injection ,and photography and metal plating.