The big picture
Six methods. Each one finds one real difference. Then it uses that difference.
| Idea | Remember | Example |
|---|---|---|
| Why separate | Keep what you want, remove what you do not, or both. | stones out of rice |
| By size | Sieving: size alone decides what passes. | flour through a sieve |
| By weight | Winnowing needs moving air and a real gap in weight. | wheat grain and husk |
| Settling | Left still, heavy bits sink. Then decant. | muddy pond water |
| Filtering | Catches solid bits. Not what has dissolved. | sand caught, salt passes |
| Getting it back | Evaporate the water. The dissolved solid stays. | salt left in a dry dish |
| With a magnet | A magnet pulls iron and steel. It does not pull sawdust. | iron nails out of sawdust |
Now open your NCERT chapter. You have already tried every method.