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Question
Which of the following change cannot be reversed?
Options
Hardening of cement
Freezing of ice cream
Opening a door
Melting of chocolate
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Solution
Hardening of cement
Explanation:
Hardening of cement is cannot be reversed because once hardened it cannot come back to its original shape.
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RELATED QUESTIONS
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?
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Evaporation of water is a reversible change.
What are reversible changes?
What are irreversible changes?
Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?
Can we reverse the following change? If yes, suggest the name of the method.
Water vapour into water
Boojho’s sister broke a white dove, a symbol of peace, made of Plaster of Paris (POP). Boojho tried to reconstruct the toy by making a powder of the broken pieces and then making a paste by mixing water. Will he be successful in his effort? Justify your answer.
