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प्रश्न
Differentiate between the following:
Deliquescent salt and hygroscopic salt
उत्तर
| Deliquescent salt | Hygroscopic salt: |
| Water soluble salts which on exposure to the atmosphere absorb moisture from the atmosphere dissolve in the absorbed moisture and change into liquid state are called Deliquescent salt. e.g. washing soda (Na2CO3.10H2O) | Absorb water or moisture from the atmosphere when exposed but do not change their state like delinquent salts. e.g. Cone. H2SO4, quick lime CaO. |
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संबंधित प्रश्न
Define water of crystallization. Give two examples with formulae.
Give two examples of Crystalline anhydrous substances.
The sticky substance formed when soap is added to hard water is ______.
Give the names and formulae of two substances
Anhydrous substance
What are drying or desiccating agents? Give examples.
Complete the following table:
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Common Name |
Chemical Name |
Formula |
Acid, base or salt |
Efflorescent, hygroscopic or deliquescent substance |
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Solid caustic potash |
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Quick lime |
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Oil of vitriol |
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Washing soda |
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Solid caustic soda |
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Blue vitriol |
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Explain the following observation:
Why is fused calcium chloride or cone, sulphuric acid used in a desiccator?
Select the correct word from the words in option to complete the sentence:
Efflorescence occurs when the vapour pressure of the hydrated crystals is ____ than the vapour pressure of the atmospheric humidity.
'A' is a blue coloured crystalline salt. On heating, it loses blue colour and to give 'B'. When water is added, 'B' gives back to 'A'. Identify A and B, write the equation.
What happens when MgSO4.7H2O is heated? Write the appropriate equation?
