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प्रश्न
Give a reason for the following:
Heating a hydrated copper sulphate crystal is deemed a chemical change.
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उत्तर
Heating hydrated copper sulphate crystal is a chemical change as on adding water drops on white powder of CuSO4 (amorphous) colour restores but geometric shape is not restored i.e. after heating new composition is found to give crystalline shape.
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संबंधित प्रश्न
Define water of crystallization. Give two examples with formulae.
Give the names and formulae of two substances
Anhydrous substance
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.
Differentiate between ‘hydrated’ & ‘anhydrous’ crystals. Give the chemical formula of – the following hydrated crystals -
(a) Washing soda
(b) Gypsum
(c) Blue vitriol
(d) Epsom salt
(e) Glauber’s salt.
State which crystal from (a) to (e) is a pentahydrate.
Differentiate the function of concentrated sulphuric acid as a drying agent & as a dehydrating agent. Is fused calcium chloride a dehydrating or a desiccating agent. Give reasons.
Complete the statement by filling the blank with the correct word from the option.
Hygroscopic substance absorb moisture from the atmosphere & _______their original state.
Explain the following observation:
Why is fused calcium chloride or cone, sulphuric acid used in a desiccator?
Name or state the following:
A liquid hydroscopic substance.
