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प्रश्न
How would you show that blue copper sulphate crystals contain water of crystallisation?
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उत्तर
Copper sulphate crystals (CuSO4.5H2O) are blue in colour. When copper sulphate crystals are heated strongly, they lose all the water of crystallisation and form anhydrous copper sulphate (which is white).
\[\ce{\underset{(Blue)}{\underset{Hydrated copper sulphate}{CuSO4*5H2O}} ->[Heat] \underset{(White)}{\underset{ Anhydrous copper sulphate}{CuSO4}} + \underset{(Goes away)}{\underset{Water}{5H2O}}}\]
Thus, on strong heating, blue copper sulphate crystals turn white (due to the loss of water of crystallisation).
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संबंधित प्रश्न
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CuSO4.5H2O or CuSO4
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pH equal to 7
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Copper sulphate crystals
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Name a salt whose solubility decreases with temperature.
Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.
|
(1) |
Calcium Sulphate |
(2) |
Sodium Sulphate |
|
(3) |
Calcium Chloride |
(4) |
Potassium Sulphate |
|
(5) |
Sodium Hydrogen Carbonate |
(6) |
Magnesium Chloride |
(A) 1, 2 and 4
(B) 1, 3 and 6
(C) 3, 5 and 6
(D) 2, 4 and 5
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