Advertisements
Advertisements
प्रश्न
Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?
Advertisements
उत्तर
The solubility of a substance decreases with decreases in temperature. After the addition of ice, the temperature of the lemonade decreases, and dissolving sugar in cold water is difficult. Therefore, ice should be added to lemonade after dissolving the sugar.
संबंधित प्रश्न
How is sodium chloride different from its constituent elements ?
Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.
Salt from sea water
Name the following:
The heavier liquid component from mercury and water.
Compare the properties of iron [II] sulphide with the iron-sulphur mixture, considering iron [II] sulphide as a compound & particles of iron & sulphur mixed together as an example of a mixture.
State any one method – to separate the following mixtures – Two solid mixtures one of which – dissolves in a – particular solvent and other does not
Give a reason for the following statement :
Zinc is considered an element, while zinc sulphide is considered a compound.
Malar’s mother was preparing to cook dinner. She accidentally mixed ground nuts with urad-dhal. Suggest a suitable method to separate the two substances so that Malar can have ground nuts to eat.
Name the components in each of the following mixtures.
- Ice cream
- Lemonade
- Air
- Soil
Grain and husk can be separated with the process of decantation.
Match the mixtures in column I with their method of separation in column II.
| COLUMN I | COLUMN II | ||
| (a) | Oil mixed in water | (i) | Sieving |
| (b) | Iron powder mixed with flour | (ii) | Hand picking |
| (c) | Salt mixed with water | (iii) | Decantation |
| (d) | Lady’s finger mixed with french beans | (iv) | Magnet |
| (e) | Rice flour mixed with kidney beans | (v) | Evaporation |
