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प्रश्न
'A' is a blue coloured crystalline salt. On heating, it loses blue colour and to give 'B'. When water is added, 'B' gives back to 'A'. Identify A and B, write the equation.
उत्तर
Since ‘A’ is a blue coloured crystalline salt, it is CuSO4. 5H2O (Blue vitriol). On heating, it loses all five water molecules and becomes colourless anhydrous CuSO4.
\[\ce{\underset{\text{(A)}}{CuSO4.5H2O} ⇌[heating][cooling]\underset{\text{anhy. copper sulphate} Colourless (B)}{CuSO4 + 5H2O}}\]
When water is added ‘B’ gives back A.
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संबंधित प्रश्न
Give one word for the following statement:
A substance which does not contain water .
Give one word for the following statement:
A property due to which a substance absorbs water without dissolving.
The substance that can remove hydrogen and oxygen atoms in the ratio of 2:1(in the form of water) from the compound.
What are drying or desiccating agents? Give examples.
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 _____.
Differentiate between the following:
Deliquescent salt and hygroscopic salt
Match the following
| 1. | Blue vitriol | CaSO4.2H2O |
| 2. | Gypsum | CaO |
| 3. | Deliquescence | CuSO4.5H2O |
| 4. | Hygroscopic | NaOH |
