Give one example of change which occurs on mixing two substances, but cannot be reversed.

एका वाक्यात उत्तर

Mixing of cement and water is an irreversible change.

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पाठ 6: Changes Around Us - Long Answer Questions [पृष्ठ ३५]

पाठ 6 Changes Around Us
Long Answer Questions | Q 15. (e) | पृष्ठ ३५

Very Short Answer Type Question:
Some common changes are given in the below Table. Which of these changes do you think can be reversed?

Change	Can be reversed
(i) Raw egg to boiled egg	Yes/No
(ii) Batter to idli
(iii) Wet clothes to dirty clothes
(iv) Woollen yarn to knitted sweater
(v) Grain to its flour
(vi) Cold milk to hot milk
(vii) straight string to a cold string
(viii) Bud to flower
(ix) Milk to paneer
(x) Cow dung to biogas
(xi) stretched rubber band to its normal size
(xii) Melting of ice-cream

Long Answer Type Question:
How does curd being set? Is this change reversible?

Chemical reactions are example for

Circle the odd one.

Circle the odd one.

Drying of wet clothes in air is an example of

Analogy

Dissolution of glucose : reversible change :: Digestion of food: ___________ change

Give examples to explain the difference between changes that can or cannot be reversed.

Give one example of change which occurs on cooling but can be reversed.

Find the odd one out. Give reason for your choice.