Question

Which of the following changes cannot be reversed?

• A. Milk to paneer
• B. Cold milk to hot milk
• C. Yam to a knitted sweater
• D. Wet clothes to dry clothes

Answer 1

The correct option is A

Milk to paneer

Explanation for correct option:

(A) Milk to paneer

Irreversible changes:

• Irreversible changes are permanent changes.
• Chemical changes are generally irreversible changes.
• Examples of irreversible changes are Cooking food and the formation of water from Hydrogen as well as Oxygen.
• Paneer cannot be converted to milk.
• Milk to paneer is irreversible as it is a permanent change

Explanation for incorrect options:

Reversible changes:

• Any changes which can be reversed or are a temporary conversion.
• Physical changes are generally reversible.
• Examples of reversible changes are Melting, freezing, boiling water, etc.

The changes like cold milk to hot milk, yam to knitted sweaters, and wet clothes to dry clothes are considered reversible changes as they can be reversed back into their original form. Thus, options B, C, and D are incorrect.

Hence, the correct option is A i.e. milk to paneer is an irreversible change.