Tag: food chemistry

Questions Related to food chemistry

Fermentation was discovered by:

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

  1. Vant Hoff and Le Bell.

  2. Louis Pasteur.

  3. Berzelius.

  4. Kolbe.

Show answer
Correct Option: B
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.

$NaCl$ is used as a food preservative and in freezing mixtures.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Bacteria cannot survive in salt conditions as water is completely extracted by salt due to its hygroscopic nature.

Therefore, $NaCl$ is used as a food- preservatives and in freezing mixtures.
So the given statement is true.

Which one of following is employed as a tranquilizer ?

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

  1. Chlorpheninamine

  2. Equanil

  3. Naproxen

  4. Tetracycline

Show answer
Correct Option: B
Explanation:

Equanil is a diasaccharide [Everday life]

Milk can be preserved by adding a few drops of:

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

  1. formic acid solution

  2. formaldehyde solution

  3. acetic acid solution

  4. acetaldehyde solution

Show answer
Correct Option: A
Explanation:

Formic acid $\Rightarrow H - \overset{O}{\overset{||}{C}} - OH$
Formic acid is used to preserve Milk.

Muddy water can be purified through coagulation by using :
evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. $\text{common slat}$

  2. $\text{alums}$

  3. $\text{sand}$

  4. $\text{lime}$

Show answer
Correct Option: B
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.

Which of the following are used as food preservative?

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

  1. Table salt

  2. Sodium hydrogen carbonate

  3. Cane sugar

  4. Benzoic acid

Show answer
Correct Option: A,C
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.

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

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

  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.

Show answer
Correct Option: C
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.

Assertion : Preservatives are added to food items
Reason : Preservatives inhibit the growth of microorganisms

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

  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

Show answer
Correct Option: A
Explanation:

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


Preservatives increase shelf life of food materials by inhibiting growth of micro organisms and that is the reason why they are added to food items. 

The food is kept at low temperatures in a refrigerator because it:

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

  1. saves money

  2. makes food more tastier

  3. kills bacteria present in the food

  4. is fashionable to keep the food in the refrigerator

Show answer
Correct Option: C
Explanation:

Bacteria do not grow at low-temperatures. So, food is stored at low-temperatures in refrigerator.


(iii) Which class of drugs is used in sleeping pills?

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

  1. tranquilizers

  2. Antacid

  3. Disprine

  4. Paracetamol

Show answer
Correct Option: A
Explanation:

A tranquilliser :- refers to a drug which is designed for the treatment of anxiety, fear, tension, agitation, and disturbances of the mind, specifically to reduce states of anxiety and tension. 


It is also used in Sleeping pills.