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Question
While lighting a candle, Paheli observed the following changes.
- Wax was melting
- Candle was burning
- Size of the candle was reducing
- Melted wax was getting solidified.
Of the above, the changes that can be reversed are
Options
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
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Solution
(i) and (iv)
Explanation:
Solid wax can be melted and melted wax gets solidifies again. Hence melting of wax and its solidification are reversible changes.
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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 |
Circle the odd one.
Differentiate reversible and irreversible changes.
Burning of match stick is a reversible change.
Periodical removal of one of the products of a reversible reaction increases the yield.
Change is the ______ of a substance from one form to another.
Touch me not plant: ______:: digestion of food: Irreversible change.
Salt can be separated from its solution (salt dissolved in water), because ______.
Give one example of change which occurs on mixing two substances, but cannot be reversed.
Choose the odd one out. Give reason for your choice.
