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Question
Name or state the following:
A liquid hydroscopic substance.
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Solution
A liquid hygroscopic substance - concentrated sulphuric acid (cone. H2SO4)
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|
Common Name |
Chemical Name |
Formula |
Acid, base or salt |
Efflorescent, hygroscopic or deliquescent substance |
|
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Quick lime |
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Oil of vitriol |
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Washing soda |
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Solid caustic soda |
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Blue vitriol |
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State the methods by which hydrated salts can be made anhydrous.
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 |
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| 3. Magnesium chloride | C: Temporary hardness in water |
| 4. Magnesium bicarbonate | D: Heptahydrate |
| 5. Calcium oxide | E: Colloidal |
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Efflorescence occurs when the vapour pressure of the hydrated crystals is ____ than the vapour pressure of the atmospheric humidity.
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An anhydrate of a heptahydrate salt _____.
A hot saturated solution of copper sulphate forms crystals as it cools. Why?
