Question

Which of the following gases is used as a preservative in the juice of fruits and jams?
a.Carbon dioxide
b.Sulphur dioxide
c.Dihydrogen
d.ammonia

Answer 1

Hint: All that you must know is the concept of the preservative of food and its types. In this, we can able to see about the most common food preservatives which are used in the juice of fruits and jam. We can also see the nature of the food preservatives.
Sulphur dioxide is responsible for the smell of burnt matches as it is a toxic gas. By the product of copper extraction and the burning of bearing fossil fuels-sulfur, sulphur dioxide is produced.

Complete answer:
Sulphur dioxide
The good preservative is a Sulphur dioxide gas because,
It is antimicrobial in nature.
It is a great antioxidant. It helps for food material to prevent rotting.
As it is antimicrobial, to prevent the growth of microorganisms so it is used in the preservation of dried foodstuff and fruit juices

Benzoic Acid and Sodium benzoate are the most common two food preservators.
A preservative prevents retardation and decomposition of food when added to the food.
Benzoic acid.
Calcium Sorbate.
Erythorbic Acid.
Potassium Nitrate.
Sodium Benzoate.
These are some examples of the preservatives used in food.

Option b is the correct answer.

Note:
Gas used for food
Sodium benzoate is a common preservative for acid or acidified foods are such as fruit juices, syrups, jams and jellies, sauerkraut, pickles, preserves, fruit cocktails, etc.