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

एक पंक्ति में उत्तर

Mixing of cement and water is an irreversible change.

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

अध्याय 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

Short Answer Type Question:
What happens when sugar is heated?

Formation of curd from milk is

Magnet attracts iron needle.This is ______ change.

Burning of match stick is a reversible change.

Changes which cannot be reversed are called ______.

What are reversible changes?

An iron ring is heated. Which of the following statement about it is incorrect?

Give one example of change occurs on mixing two substances, but can be reversed.

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