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प्रश्न
Fill in the blank
___________ is the phenomenon by which hydrated salts on exposure to dry air, lose their water of crystallization and crumble to powder.
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उत्तर
Efflorescence is the phenomenon by which hydrated salts on exposure to dry air lose their water of crystallisation and crumble to powder.
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संबंधित प्रश्न
Name three chemicals made from common salt (or sodium chloride).
Explain how anhydrous copper sulphate can be used to detect the presence of moisture (water) in a liquid
Give the names and formulae of any two salts. Also name the acids and bases from which these salt may be obtained.
The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B, C and D
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO4
Which of salts will give:
acidic solutions?
How many molecules of water of crystallisation (per formula unit) are present in:
copper sulphate crystals?
What is a ‘salt’?
Name a salt whose solubility decreases with temperature.
name two salts which are acidic.
Copy and complete the following table which refers to the action of heat on some carbonates:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead carbonate | |
| Copper carbonate |
