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प्रश्न
What are hydrous substances? Explain with examples.
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उत्तर
Substances which contain water molecules along with salt are hydrated substances.
Examples: Sodium carbonate decahydrate: Na2CO3.10H2O
Copper sulphate pentahydrate: CuSO4.5H2O
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संबंधित प्रश्न
The sticky substance formed when soap is added to hard water is ______.
Name three methods by which hydrous substances can be made anhydrous.
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.
Differentiate between ‘hydrated’ & ‘anhydrous’ crystals. Give the chemical formula of – the following hydrated crystals -
(a) Washing soda
(b) Gypsum
(c) Blue vitriol
(d) Epsom salt
(e) Glauber’s salt.
State which crystal from (a) to (e) is a pentahydrate.
Explain the following observation:
In the expression anhydrous copper sulphate, what is meant by “anhydrous”?
Select the correct answer from the choice given in the options.
An anhydrous crystal _____.
Differentiate between the following:
Deliquescent salt and hygroscopic salt
Match the following
| 1. | Blue vitriol | CaSO4.2H2O |
| 2. | Gypsum | CaO |
| 3. | Deliquescence | CuSO4.5H2O |
| 4. | Hygroscopic | NaOH |
The molecular formula of green vitriol is MgSO4.7H2O.
What happens when MgSO4.7H2O is heated? Write the appropriate equation?
