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प्रश्न
Match the following.
| Srl. no. | A | B | C |
| i | Separation of visible undesirable components | Water mixed with chalk powder | Magnetic Separation |
| ii | Separation of heavier and lighter components | Sand and water | Decantation |
| iii | Separation of insoluble impurities | Iron impurities | Filtration |
| iv | Separation of magnetic components from non-magnetic components | Rice and stone | Hand-picking |
| v | Separation of solids from liquids | Husk and paddy | Winnowing |
उत्तर
| Srl. no. | A | B | C |
| i | Separation of visible undesirable components | Rice and stone | Hand-picking |
| ii | Separation of heavier and lighter components | Husk and paddy | Winnowing |
| iii | Separation of insoluble impurities | Water mixed with chalk powder | Filtration |
| iv | Separation of magnetic components from non-magnetic components | Iron impurities | Magnetic Separation |
| v | Separation of solids from liquids | Sand and water | Decantation |
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A strong current of trivalent gaseous boron passed through a silicon crystal decreases the density of the crystal due to part replacement of silicon by boron and due to interstitial vacancies created by missing Si atoms. In one such experiment, one gram of silicon is taken and the boron atoms are found to be 1000 ppm by weight, when the density of the Si crystal decreases by 12%. The percentage of missing vacancies due to silicon, which are filled up by boron atoms will be ____ g. [Given · Atomic wt. Si= 30, B = 11]
