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:
Give two examples of reversible changes.

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

Match the following.

Differentiate reversible and irreversible changes.

Changes which cannot be reversed are called ______.

Dissolving sugar in water is a ______ change.

Evaporation of water is a reversible change.

The burning of the paper is an irreversible change.

Can we reverse the following change? If yes, suggest the name of the method.

Water vapour into water

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