Question

9. Which of the following is not
used as food preservatives?
O
salt
O sugar
O Vinegar
O Methane​

Answer 1

Answer: (b)Sugar

Explanation: Food preservative spilage of food due to microbial growth. The most commonly used preservatives include table salt, sugar, vegetable oils and sodium benzoate. Sodium hydrogen carbonate and cane sugar are not used as food preservatives.

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Answer 2

Answer:

Methane is not used as food preservative.

Explanation:

• Salt helps in reduction of water activity of food. Water activity is the unbound water available for chemical reaction. Even before refrigeration, salt has been used for preserving food. It is the most effective natural preservative.

• Sugar helps in preserving the color, texture and flavor of food. It helps in stabilizing and maintaining water content in food which results in slow growth of bacteria.

• Vinegar is also used as food preservative. It is made from fermentation of sugar and water and it used as natural preservative. Its low pH and acetic acid content helps in preservation of food.

• Methane cannot be used as a food preservative because of its higher pH value.