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प्रश्न
The process of separation or deposition of crystals from a hot saturated solution on gentle cooling of the solution is called ‘crystallization’. With reference to the statement explain what is meant by ‘water of crystallization. State which physical properties of a crystal are correlated with the water of crystallization.
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उत्तर
The water of crystallization is the number of water molecules that combine chemically – in definite proportion with the – concerned salt in the crystalline state.
Or
Some salts, while crystallizing out from their solutions unite with a definite quantity of water, which is known as the water of crystallization. Physical properties are that crystals are solid, definite regular shapes.
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संबंधित प्रश्न
Define water of crystallization. Give two examples with formulae.
Give one word for the following statement:
A property due to which a substance absorbs water without dissolving.
Give one word for the following statement:
Water molecules in loose chemical combination with other substances.
Give the names and formulae of two substances.
Hydrated substance
Give the names and formulae of two substances
Anhydrous substance
The substance that can remove hydrogen and oxygen atoms in the ratio of 2:1(in the form of water) from the compound.
Complete the following table:
|
Common Name |
Chemical Name |
Formula |
Acid, base or salt |
Efflorescent, hygroscopic or deliquescent substance |
|
Solid caustic potash |
|
|
|
|
|
Quick lime |
|
|
|
|
|
Oil of vitriol |
|
|
|
|
|
Washing soda |
|
|
|
|
|
Solid caustic soda |
|
|
|
|
|
Blue vitriol |
|
|
|
|
Explain the following observation:
Why is fused calcium chloride or cone, sulphuric acid used in a desiccator?
The molecular formula of green vitriol is MgSO4.7H2O.
Define Hydrated salt.
