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प्रश्न
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
उत्तर
The gases of air can be separated by fractional distillation of liquid air because they have different boiling points.
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संबंधित प्रश्न
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Name one element, one compound and one mixture.
The three important metalloids are.............................. and ..........................
What elements do the following compounds contain ?
Sugar, Common salt
How would you confirm that a colourless liquid given to your is pure water ?
State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
Describe a method to separate a mixture of common salt and sand.
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
How will you separate water from mustard oil ?
What is chromatography ? State its two applications.
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Liquids cannot be compressed and they have fixed volume.
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
The phenomenon of Evaporation takes place at the ______ of a liquid.
Define the term matter.
