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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
State one relevant observation for the following:
Anhydrous calcium chloride is exposed to air for some time.
Which of the following salt has a blue colour and why?
CuSO4.5H2O or CuSO4
How is common salt obtained from sea-water?
Why is sodium chloride required in our body?
What is a salt?
The pH values of three solutions A, B and C are given in the table. Answer the folloiwng questions:
| Solution | pH value |
| A | 12 |
| B | 2 |
| C | 7 |
Which solution will liberate CO2 when reacted with sodium carbonate?
Taking sodium carbonate as an example, give the meaning of the following terms:
Water of crystallization
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 |
Many salts absorb water from the atmosphere. This property is called:
One of the constituents of baking powder is sodium hydrogencarbonate. The other constituent is :
