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प्रश्न
Differentiate between hydrated and anhydrous crystals with examples. State three defined changes that occur when hydrated copper sulphate is heated.
उत्तर
Difference between hydrated and anhydrous crystals:
| Hydrated crystal | Anhydrous crystal |
| (i) Contains fixed number of water molecules. | (i) Does not contains any fixed number of water molecules |
| (ii) CuSO4, 5H2O, FeSO4.7H2O are examples. | KNO3, K2SO4 are examples. |
Three defined changes: When CuSO4. 5H2O is heated take place are: (blue).
- Colour changes from blue to colourless.
- Changed to AMORPHOUS white powder
- Geometric shape vanishes
- On cooling and adding water colour restores but crystalline does not shape.
APPEARS IN
संबंधित प्रश्न
Give two examples for Deliquescent substance.
Water turns the colour of anhydrous copper sulphate .................
Give one word for the following statement:
A substance which does not contain water .
Give the names and formulae of two substances
Anhydrous substance
What are hydrous substances? Explain with examples.
Name three methods by which hydrous substances can be made anhydrous.
Complete the statement by filling the blank with the correct word from the option.
Hygroscopic substance absorb moisture from the atmosphere & _______their original state.
Select the correct answer from the choice given in the options.
An anhydrate of a heptahydrate salt _____.
Name or state the following:
A liquid hydroscopic substance.
Match the following
| 1. | Blue vitriol | CaSO4.2H2O |
| 2. | Gypsum | CaO |
| 3. | Deliquescence | CuSO4.5H2O |
| 4. | Hygroscopic | NaOH |
