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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 substance which does not contain water .
Give one word for the following statement:
Water molecules in loose chemical combination with other substances.
Give the names and formulae of two substances
Anhydrous substance
What are hydrous substances? Explain with examples.
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 |
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 _____.
Match the following
| 1. | Blue vitriol | CaSO4.2H2O |
| 2. | Gypsum | CaO |
| 3. | Deliquescence | CuSO4.5H2O |
| 4. | Hygroscopic | NaOH |
