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Multiple choice evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

Fermentation was discovered by:

  1. Vant Hoff and Le Bell.

  2. Louis Pasteur.

  3. Berzelius.

  4. Kolbe.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Louis Pasteur discovered fermentation.


 In 1860, he demonstrated that bacteria cause souring in milk, a process formerly thought to be merely a chemical change, and his work in identifying the role of microorganisms in food spoilage led to the process of pasteurization.

 Option B is correct.

Multiple choice evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry
Muddy water can be purified through coagulation by using :
  1. $\text{common slat}$
  2. $\text{alums}$
  3. $\text{sand}$
  4. $\text{lime}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Muddy water can be purified through coagulation by using alums. 


It is added to the water so that the negatively charged colloidal particles clump together into Flocks which then float to the top of the liquid settle to the bottom of the liquid, or can be more easily filtered from the liquid, prior to further filtration and disinfection of the water.

Multiple choice evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

Which of the following are used as food preservative?

  1. Table salt

  2. Sodium hydrogen carbonate

  3. Cane sugar

  4. Benzoic acid
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation
A preservative is a substance that is added to products such as foods, pharmaceuticals, paints, biological samples, wood, etc. to prevent  decomposition by microbial growth or by undesirable chemical changes.

Food preservation usually involves preventing the growth of bacteria,fungi (such as yest), or other microorganisms (although some methods work by introducing benign bacteria or fungi to the food), as well as retarding the oxidation of fats that cause rancidity.

The earliest cultures have used sugar as a preservative, and it was  commonplace to store fruit in honey. Similar to pickled foods, sugar cane was brought to Europe through the trade routes. In chemical pickling, the food is placed in an edible liquid that inhibits or kills bacteria and other micro-organisms. Typical pickling agents include  table salt.

Hence A & C are correct options.
Multiple choice evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

Assertion: All chemical added to food items are called food preservatives.
Reason: All the chemicals increase the nutritive value of the food.

  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

  2. Both Assertion and Reason are correct but Reason is NOT the correct explanation for Assertion.

  3. Both Assertion and Reason are incorrect.

  4. Assertion is correct but Reason is incorrect.

  5. Assertion is incorrect but Reason is correct.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Various chemicals are added to food. They are called food additives and are flavours and sweeteners, food colours (dyes), fat emulsifiers and stablising agents, flour improvers antistaling agents and bleaches, antioxidants, preservatives and nutritional supplements.
Thus, only few chemicals added to food items are called food preservatives.
and Only few chemicals increase the nutritive value of the food.
Hence, both Assertion and Reason are incorrect.