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प्रश्न
A hot saturated solution of copper sulphate forms crystals as it cools. Why?
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उत्तर
A hot saturated solution of CuSO4 forms crystal as it cools. Because on cooling the water molecules move closer together and there is less space for the solution to hold on to as much of the dissolved solid and so it forms crystals.
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संबंधित प्रश्न
The sticky substance formed when soap is added to hard water is ______.
Give one word for the following statement:
A property due to which a substance absorbs water without dissolving.
Give the names and formulae of two substances.
Hydrated substance
Give the names and formulae of two substances
Anhydrous substance
What are hydrous substances? Explain with examples.
Complete the statement by filling the blank with the correct word from the option.
Hygroscopic substance absorb moisture from the atmosphere & _______their original state.
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:
Why is fused calcium chloride or cone, sulphuric acid used in a desiccator?
Select the correct answer from the choice given in the options.
An anhydrate of a heptahydrate salt _____.
Give a reason for the following:
Heating a hydrated copper sulphate crystal is deemed a chemical change.
