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?
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.
APPEARS IN
संबंधित प्रश्न
Why is iron sulphide a compound ?
What is chromatography? For which type of mixture is it used?
Fill in the blank
Mixtures can be ...................... or .....................
A _______ is formed when one liquid is dispersed as tiny droplets throughout another liquid
Name the following:
The compound containing one atom of sulphur and two atoms of oxygen.
State any one method – to separate the following mixtures – A liquid-liquid mixture containing – two miscible liquids having different boiling points.
Explain with a diagram the process used to – separate the following substance from the given mixture.
Potassium nitrate from a mixture of – potassium nitrate & potassium chlorate.
Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed. Which of the following should be Boojho’s answer?
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 |
A mixture of iron nails, salt, oil and water is provided to you. Give stepwise methods to separate each component from this mixture.
