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प्रश्न
Define water of crystallization. Give two examples with formulae.
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उत्तर
The fixed amount of water which is in loose chemical combination with a salt in its crystal is called water of crystallization.
Examples:
| Common name | Chemical name | Formulae |
| Blue vitroil | Copper sulphate pentahydrate |
CuSO4 5H2O |
| Green vitriol | Iron (2) sulphate heptahydrate | FeSO4 7H2O |
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संबंधित प्रश्न
Give two examples of Crystalline anhydrous substances.
State the methods by which hydrated salts 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.
Differentiate the function of concentrated sulphuric acid as a drying agent & as a dehydrating agent. Is fused calcium chloride a dehydrating or a desiccating agent. Give reasons.
Match the substances in List I with the appropriate answer in List II.
| List I | List II |
| 1. Green vitriol | A: Permanent hardness in water |
| 2. Paint | B: Hygroscopic |
| 3. Magnesium chloride | C: Temporary hardness in water |
| 4. Magnesium bicarbonate | D: Heptahydrate |
| 5. Calcium oxide | E: Colloidal |
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 _____.
Select the correct answer from the choice given in the options.
An anhydrate of a heptahydrate salt _____.
What happens when MgSO4.7H2O is heated? Write the appropriate equation?
