E. Answer the following questions.
1. Give any three reasons for spoilage of food.
2. How is food preservation useful to us?
3. Why is it important to check the manufacturing and the expiry date of
packaged food items before consuming them?
4. Explain the following methods of food preservation:
(a) Dehydration (b) Canning and Bottling (c) Pasteurisation
5. Rakesh bought two raw papayas. He kept one papaya in the refrigerator
and other papaya on the kitchen shelf. Which will ripen first and why?
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Explanation:
A student investigated the reaction of aqueous potassium hydroxide with two different
acids, acid C and D.
Two experiments were carried out.
Experiment 1
By using a measuring cylinder, 40 cm of aqueous potassium hydroxide was poured into a
conical flask and the initial temperature of the solution was measured.
A burette was filled with acid C up to the 0.0 cm mark.
10 cm of acid C was added to the potassium hydroxide in the flask. The temperature of the
mixture was measured?
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