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प्रश्न
Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles?
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उत्तर
The rate of evaporation depends on the nature of the liquid, i.e., more volatile liquids like alcohol and spirits evaporate easily; hence, these are stored in tightly closed bottles to avoid their evaporation.
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संबंधित प्रश्न
A liquid can change into vapour state at all temperatures.
Why does all the water of the earth not get evaporated during hot summer days ?
If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool ?
How does the water kept in an earthen pot (matka) become cold during summer ?
The evaporation of water increases under the following conditions :
The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.
- Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
- Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
- Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
- Name the most common substance belonging to state A.
- Which state of matter makes the sun and other stars to glow ?
Comment on the following statements:
Evaporation produces cooling.
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
Evaporation is a fast process and occurs only at the surface of the liquid.
When lemon juice is mixed with soda water, they produce brisk effervescence.
