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प्रश्न
Give a scientific reason.
A wet cloth is wrapped around a water storage container in summer.
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उत्तर
A wet cloth is wrapped around water containers in summers to keep the container and the water inside it cool. The water present in the cloth evapourates and along with that water, the heat also evapourates thus keeping the container and water cool.
संबंधित प्रश्न
Write an answer to the following question in your own words.
Where are the methods of separation by distillation and by separating funnel used? Why?
State the correct technique for the separation of the following mixture.
a low boiling point liquid from a high boiling point liquid.
Methyl alcohol and water
- Give the principle involved in the separation of the mixture
- Give the technique of separation of the mixture.
Why is a condenser used in distillation process?
What will happen if the upper outlet of the condenser is connected to the tap instead of the lower outlet?
Define Distillation
Alcohol can be separated from water by ______.
Match the type of mixture of compounds in Column I with the technique of separation/purification given in Column II.
| Column I | Column II |
| (i) Two solids which have different solubilities in a solvent and which do not undergo reaction when dissolved in it. | (a) Steam distillation |
| (ii) Liquid that decomposes at its boiling point | (b) Fractional distillation |
| (iii) Steam volatile liquid | (c) Simple distillation |
| (iv) Two liquids which have boiling points close to each other | (d) Distillation under reduced pressure |
| (v) Two liquids with large difference in boiling points. | (e) Crystallisation |
Two liquids (A) and (B) can be separated by the method of fractional distillation. The boiling point of liquid (A) is less than boiling point of liquid (B). Which of the liquids do you expect to come out first in the distillate? Explain.
Explain the factors, which will affect the rate of evaporation, taking examples from our daily life experiences.
