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प्रश्न
What do you observe when Blue vitriol is heated?
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उत्तर
Blue vitriol is blue in colour as it contains 5 molecules of water of crystallization (CuSO4.H2O). When it is heated, it loses water of crystallization and becomes anhydrous CuSO4 which is grey-white in colour.
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संबंधित प्रश्न
Water turns the colour of anhydrous copper sulphate .................
Give one word for the following statement:
A substance which does not contain water .
Complete the following table:
|
Common Name |
Chemical Name |
Formula |
Acid, base or salt |
Efflorescent, hygroscopic or deliquescent substance |
|
Solid caustic potash |
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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.
Name three methods by which hydrous substances can be made anhydrous.
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.
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.
Match the following
| 1. | Blue vitriol | CaSO4.2H2O |
| 2. | Gypsum | CaO |
| 3. | Deliquescence | CuSO4.5H2O |
| 4. | Hygroscopic | NaOH |
