Question

10. In which of the following, the identity of initial substance remains
unchanged?
(a) Curdling of milk
(b) Formation of crystals by process of crystallisation
(c)Fermentation of grapes
(d) Digestion of food ​

Answer 1

The identity of initial substance remains  unchanged in :

(b) Formation of crystals by process of crystallisation .

- In curdling of milk, the milk gets converted into curd.

- In the formation of crystals by process of crystallisation, the composition of initial substance does not changes but it merely gets crystallised.

- During fermentation of grapes, the grape juice gets converted into an alcoholic product which is used as a beverage.

- During digestion, the food gets changed into waste product after giving out energy. Hence it does not remain the same.

- So the correct answer is option (b)

Answer 2

The identity of initial substance remains  unchanged in crystallization.

Option: B

Explanation:

• Crystallization or the formation of crystals is a commonly used technique used in laboratories.
• This is due to their irreversible nature, it can be dissolved and made into a solvent.
• In the lab, we can reverse these conditions and be reversed from its crystallized state.
• The other options like curdling of milk, fermentation of grapes, and digestion of food completely changes the identity of the substance and cannot be reversed.

To Know More

Which of the following is a example of covalent crystalline solid​ https://brainly.in/question/14510961