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प्रश्न
Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
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उत्तर
Recycling of paper cannot be classified as a reversible change because the quality, colour and texture of the paper changes on recycling and we get a different type of paper not the original one.
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संबंधित प्रश्न
Short Answer Type Question:
What happens when sugar is heated?
A stretched rubber band comes back to normal shape. It is an example for ________.
Magnet attracts iron needle.This is ______ change.
When a candle is lit the following changes are observed.
- Wax melts.
- Candle keeps burning.
- The size of the candle decreases.
- The molten wax solidifies
- Which of the changes can be reversed? Justify your answer
Periodical removal of one of the products of a reversible reaction increases the yield.
Name the two types of changes.
Look at the figure which shows three situations.
Which of these shows a reversible change and why?
Give one example of change which occurs on cooling but can be reversed.
Paheli mixed flour and water and
- made a dough,
- rolled the dough to make a chapati,
- baked the chapati on a pan,
- dried the chapati and ground it in a grinder to make powder.
Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.
Find the odd one out. Give reason for your choice.
